John Mammano

John Mammano

Realtor
john@compass.com
M: 571-331-8557
O: 202-386-6330

Social Media

Awards

Washingtonian Magazine - Top Agent, 2018, 2019, 2021

GCAAR - Gold Award Winner - Multiple Times

Member of Top Agent Network

National Association of Realtors Green designation

Specialties

Washingtonian over 20 years and a real estate agent over 15 years

Specialty Historic Properties

Charity

American Humane Society

Virginia Thoroughbred Project - Board Member

Supporter of John Eaton Elementary School

Food and Friends

Client Testimonials

★★★★★
"John is the consummate professional and an absolute joy to work with. I had never a property before, and John went above and beyond to advise me throughout the entire process. I was impressed with his ability to accurately predict unforeseen costs, timelines, and multiple other hidden issues. He did so much work before the property was listed that the entire process flowed very smoothly. In fact, I had multiple offers far above the asking price within 3 days of . John will be the first person I contact for my future real estate needs." - Caroline

★★★★★
"We are writing this letter to convey our great satisfaction with our Realtor, John Mammano, who we hired to sell our home. John was particularly helpful to us in many ways. John provided us with an effortless and efficient real estate transaction, from our first meeting to the closing. He explained the process in great detail and because of his professional demeanor and knowledge of the real estate we were confident in his skills and support. He often went the extra mile, specifically in coordinating the transaction while we were out of town and providing us with feedback including all items required for completion on the sellers checklist. John was readily available and able to answer any questions we had. Honestly, we do not know how we would have accomplished this without his help. We have no qualms about recommending John as a realtor who goes above and beyond to please his clients." - Ian & Fran

★★★★★
"John is an amazing real estate agent. He assisted our family in securing a wonderful condo our son. addition to being highly professional, he is very affable and was able to work with inter-generational needs (two parents and one young adult). He was always available to show us places and chat with us about the pros and cons of each apt. Under the last stretch of a bidding up process, which can be stressful, John used his mild manner and professional strategies to accomplish a winning my son. He is the best, do not hesitate to use him. We look forward to working with him again in the future." - Lance, Marjorie & Mark

About John
The logo of JOHN MAMMANO

John has been a Washington resident for over 20 years and a real estate agent for over 15 years. He has built his business on referrals and returning clients who trust his expertise, attention to detail and outstanding negotiation skills. John is known for his sincere business approach, team work with his clients and open communication throughout the real estate transaction. 

John credits his parents for his dedication to hard work and entrepreneurial spirit. Thanks to his family’s construction and real estate investment businesses, John was raised with the notion that hard work, smart business decisions and loving your career are the ingredients for success.

John holds a Bachelor of Arts degree in Political Science and a minor in Business Administration from Arizona State University. His prior years of working in corporate Finance and Project Management prepared him to seamlessly handle complex transactions in real estate.

John’s interests include renovation projects, design and architecture. He takes inspiration from his travels through Argentina, Brazil, Costa Rica, England, France, Spain, Mexico, Italy, Czech Republic and Hungary. As an animal lover, John is a supporter of The Humane Society.

John Mammano’s Listings

$789,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$789,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$789,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$789,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$789,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$789,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$789,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$789,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$789,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$789,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$789,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$789,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$789,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$789,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$789,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$789,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$789,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$789,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$789,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$789,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$789,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$789,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$789,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$789,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$789,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$789,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$789,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$789,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$789,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$789,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$789,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$789,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$789,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$789,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$789,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$789,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$789,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$789,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$789,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$789,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$789,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$789,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$789,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$789,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$789,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$789,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$789,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$789,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$789,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$789,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$789,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$789,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$789,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$789,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$789,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$789,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$789,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$789,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$789,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$789,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$789,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$789,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$789,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$789,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$789,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$789,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
1/66
Listed By CompassOpen: 7/12 01:30PM - 03:30PM

$789,000

2
Bedrooms
1,000
Square Feet

1126 5th Street Northwest, Unit 4, Washington, DC 20001

a view of a room with furniture and floor to ceiling window
a living room with furniture potted plant and a large window
a living room with furniture and a window
a vase of flowers sitting next to a window
a living room with furniture a large window and dining table
a living room with furniture and a large window
a living room with furniture and a book shelf
a living room with furniture and a book shelf
a living room with furniture and a large window
a living room with furniture and a large window
a view of a dining room with furniture window and outside view
a view of a dining room with furniture window and outside view
a view of a dining room with furniture window and outside view
a living room with furniture a clock and a large window
a dining room with furniture and wooden floor
a living room with furniture and a wooden floor
a kitchen with stainless steel appliances granite countertop a refrigerator microwave and sink
a kitchen with granite countertop a sink stove and cabinets
a metallic refrigerator freezer and a stove sitting inside of a kitchen
a kitchen with stainless steel appliances granite countertop a sink a stove and cabinets
a kitchen with granite countertop cabinets stainless steel appliances and a counter space
a kitchen with a sink and large window
a view of a dining room with furniture window and wooden floor
a dining room with furniture and wooden floor
a view of a dining room with furniture
a dining room with furniture and a refrigerator
a bedroom with a bed and wooden floor
a bedroom with a large bed and a window
a bedroom with a bed and wooden floor
a bedroom with a bed and a mirror
a close up of a mirror
a bathroom with a sink a toilet and a shower
a bathroom with a double vanity sink mirror and double
a bathroom with a sink double vanity and a mirror
a close view of sink and a potted plant
a bathroom with a shower a toilet and sink
a bathroom with a shower
a bathroom with a glass shower door
a living room with furniture a mirror and a window
a living room with a table and a mirror
a close view of door lock
a bathroom with a sink a mirror and a shower
a bathroom with a sink toilet a mirror and shower
a bathroom with a sink a toilet and shower
a view of a dining room with furniture
a kitchen with a stove a refrigerator and white cabinets
a living room with furniture and wooden floor
a car parked in front of a building
a view of a street with cars
a sign on the side of the tree
$510,000 | 3601 Connecticut Avenue Northwest, Unit 216, Washington, DC 20008
$510,000 | 3601 Connecticut Avenue Northwest, Unit 216, Washington, DC 20008
$510,000 | 3601 Connecticut Avenue Northwest, Unit 216, Washington, DC 20008
$510,000 | 3601 Connecticut Avenue Northwest, Unit 216, Washington, DC 20008
$510,000 | 3601 Connecticut Avenue Northwest, Unit 216, Washington, DC 20008
$510,000 | 3601 Connecticut Avenue Northwest, Unit 216, Washington, DC 20008
$510,000 | 3601 Connecticut Avenue Northwest, Unit 216, Washington, DC 20008
$510,000 | 3601 Connecticut Avenue Northwest, Unit 216, Washington, DC 20008
$510,000 | 3601 Connecticut Avenue Northwest, Unit 216, Washington, DC 20008
$510,000 | 3601 Connecticut Avenue Northwest, Unit 216, Washington, DC 20008
$510,000 | 3601 Connecticut Avenue Northwest, Unit 216, Washington, DC 20008
$510,000 | 3601 Connecticut Avenue Northwest, Unit 216, Washington, DC 20008
$510,000 | 3601 Connecticut Avenue Northwest, Unit 216, Washington, DC 20008
$510,000 | 3601 Connecticut Avenue Northwest, Unit 216, Washington, DC 20008
$510,000 | 3601 Connecticut Avenue Northwest, Unit 216, Washington, DC 20008
1/65
Listed By CompassOpen: 7/11 01:00PM - 03:00PM

$510,000

1
Bedrooms
1,100
Square Feet

3601 Connecticut Avenue Northwest, Unit 216, Washington, DC 20008

a living room with furniture and a window
a living room with furniture and a large window
a very nice looking room with many windows
a picture of floor plan
a living room with furniture and a wooden floor
a living room with furniture and a large window
a view of a livingroom with table and chair
a dining room with furniture and a chandelier
a living room with furniture and a large window
a living room with furniture and a potted plant
a living room with furniture and a mirror
a living room with furniture and window
a living room with furniture and two window
a living room with furniture and window
a view of a dining room with furniture window and outside view
a living room with furniture and a window
a dining room with furniture potted plants and wooden floor
a view of a dining room with furniture and a window
a dining room with furniture and window
a kitchen with stainless steel appliances granite countertop a sink a window and white cabinets
a kitchen with stainless steel appliances granite countertop a stove and a sink
a kitchen with stainless steel appliances granite countertop a sink a stove a table and chairs
a bathroom with a sink and a mirror
a kitchen with stainless steel appliances granite countertop a sink stove and refrigerator
a bed room with a bed and a window
a bedroom with a bed and a dresser
a view of a room with wooden floor cabinet and bedroom
a bathroom with a sink and a shower
a bathroom with a sink toilet and shower
a bathroom with a bathtub
a view of a room with gym equipment
a living room with furniture a window and gym equipment
a view of a dining room with furniture and a chandelier
a livingroom with a bookshelf and a workspace
a view of an empty room with a garage
a building outdoor space with patio furniture
a building outdoor space with patio furniture and a potted plant
$469,000 | 3601 Connecticut Avenue Northwest, Unit 107, Washington, DC 20008
$469,000 | 3601 Connecticut Avenue Northwest, Unit 107, Washington, DC 20008
$469,000 | 3601 Connecticut Avenue Northwest, Unit 107, Washington, DC 20008
$469,000 | 3601 Connecticut Avenue Northwest, Unit 107, Washington, DC 20008
$469,000 | 3601 Connecticut Avenue Northwest, Unit 107, Washington, DC 20008
$469,000 | 3601 Connecticut Avenue Northwest, Unit 107, Washington, DC 20008
$469,000 | 3601 Connecticut Avenue Northwest, Unit 107, Washington, DC 20008
$469,000 | 3601 Connecticut Avenue Northwest, Unit 107, Washington, DC 20008
$469,000 | 3601 Connecticut Avenue Northwest, Unit 107, Washington, DC 20008
1/46
Listed By CompassActive Under Contract

$469,000

1
Bedrooms
1,200
Square Feet

3601 Connecticut Avenue Northwest, Unit 107, Washington, DC 20008

$332,000 | 3039 Macomb Street Northwest, Unit 23, Washington, DC 20008
$332,000 | 3039 Macomb Street Northwest, Unit 23, Washington, DC 20008
$332,000 | 3039 Macomb Street Northwest, Unit 23, Washington, DC 20008
$332,000 | 3039 Macomb Street Northwest, Unit 23, Washington, DC 20008
$332,000 | 3039 Macomb Street Northwest, Unit 23, Washington, DC 20008
$332,000 | 3039 Macomb Street Northwest, Unit 23, Washington, DC 20008
$332,000 | 3039 Macomb Street Northwest, Unit 23, Washington, DC 20008
$332,000 | 3039 Macomb Street Northwest, Unit 23, Washington, DC 20008
$332,000 | 3039 Macomb Street Northwest, Unit 23, Washington, DC 20008
$332,000 | 3039 Macomb Street Northwest, Unit 23, Washington, DC 20008
$332,000 | 3039 Macomb Street Northwest, Unit 23, Washington, DC 20008
$332,000 | 3039 Macomb Street Northwest, Unit 23, Washington, DC 20008
$332,000 | 3039 Macomb Street Northwest, Unit 23, Washington, DC 20008
$332,000 | 3039 Macomb Street Northwest, Unit 23, Washington, DC 20008
$332,000 | 3039 Macomb Street Northwest, Unit 23, Washington, DC 20008
$332,000 | 3039 Macomb Street Northwest, Unit 23, Washington, DC 20008
$332,000 | 3039 Macomb Street Northwest, Unit 23, Washington, DC 20008
$332,000 | 3039 Macomb Street Northwest, Unit 23, Washington, DC 20008
$332,000 | 3039 Macomb Street Northwest, Unit 23, Washington, DC 20008
$332,000 | 3039 Macomb Street Northwest, Unit 23, Washington, DC 20008
$332,000 | 3039 Macomb Street Northwest, Unit 23, Washington, DC 20008
$332,000 | 3039 Macomb Street Northwest, Unit 23, Washington, DC 20008
$332,000 | 3039 Macomb Street Northwest, Unit 23, Washington, DC 20008
$332,000 | 3039 Macomb Street Northwest, Unit 23, Washington, DC 20008
$332,000 | 3039 Macomb Street Northwest, Unit 23, Washington, DC 20008
$332,000 | 3039 Macomb Street Northwest, Unit 23, Washington, DC 20008
$332,000 | 3039 Macomb Street Northwest, Unit 23, Washington, DC 20008
$332,000 | 3039 Macomb Street Northwest, Unit 23, Washington, DC 20008
$332,000 | 3039 Macomb Street Northwest, Unit 23, Washington, DC 20008
$332,000 | 3039 Macomb Street Northwest, Unit 23, Washington, DC 20008
$332,000 | 3039 Macomb Street Northwest, Unit 23, Washington, DC 20008
$332,000 | 3039 Macomb Street Northwest, Unit 23, Washington, DC 20008
$332,000 | 3039 Macomb Street Northwest, Unit 23, Washington, DC 20008
$332,000 | 3039 Macomb Street Northwest, Unit 23, Washington, DC 20008
$332,000 | 3039 Macomb Street Northwest, Unit 23, Washington, DC 20008
$332,000 | 3039 Macomb Street Northwest, Unit 23, Washington, DC 20008
$332,000 | 3039 Macomb Street Northwest, Unit 23, Washington, DC 20008
$332,000 | 3039 Macomb Street Northwest, Unit 23, Washington, DC 20008
$332,000 | 3039 Macomb Street Northwest, Unit 23, Washington, DC 20008
$332,000 | 3039 Macomb Street Northwest, Unit 23, Washington, DC 20008
$332,000 | 3039 Macomb Street Northwest, Unit 23, Washington, DC 20008
$332,000 | 3039 Macomb Street Northwest, Unit 23, Washington, DC 20008
$332,000 | 3039 Macomb Street Northwest, Unit 23, Washington, DC 20008
$332,000 | 3039 Macomb Street Northwest, Unit 23, Washington, DC 20008
$332,000 | 3039 Macomb Street Northwest, Unit 23, Washington, DC 20008
1/45
Listed By CompassActive Under Contract

$332,000

1
Bedrooms
675
Square Feet

3039 Macomb Street Northwest, Unit 23, Washington, DC 20008

John Mammano’s Transactions

Past Sales
$2,345,000 | 1318 T Street Northwest, Washington, DC 20009

$2,345,000

5
Bedrooms
3,512
Square Feet
0.06
Acres

1318 T Street Northwest, Washington, DC 20009

$1,630,000 | 3918 Livingston Street Northwest, Washington, DC 20015

$1,630,000

4
Bedrooms
3,016
Square Feet
0.14
Acres

3918 Livingston Street Northwest, Washington, DC 20015

front view of a house with a yard

$1,580,000

4
Bedrooms
3,346
Square Feet

3209 19th Street Northwest, Washington, DC 20010

$1,285,000 | 1613 30th Street Northwest, Unit 3S, Washington, DC 20007

$1,285,000

2
Bedrooms
1,400
Square Feet

1613 30th Street Northwest, Unit 3S, Washington, DC 20007

a view of a house with a small yard plants and large trees

$1,150,000

4
Bedrooms
1,707
Square Feet
0.07
Acres

5168 Fulton Street Northwest, Washington, DC 20016

a front view of a house with a yard

$1,149,000

5
Bedrooms
2,900
Square Feet
0.16
Acres

3270 Aberfoyle Place Northwest, Washington, DC 20015

$1,115,000 | 1613 30th Street Northwest, Unit 3S, Washington, DC 20007

$1,115,000

2
Bedrooms
1,358
Square Feet

1613 30th Street Northwest, Unit 3S, Washington, DC 20007

$1,048,000 | 1720 13th Street Northwest, Unit 2, Washington, DC 20009

$1,048,000

2
Bedrooms
1,570
Square Feet

1720 13th Street Northwest, Unit 2, Washington, DC 20009

a view of a building with a yard and plants

$1,000,021

2
Bedrooms
2,500
Square Feet

4000 Cathedral Avenue Northwest, Unit 813B/823B, Washington, DC 20016

$1,000,000 | 440 R Street Northwest, Unit 203, Washington, DC 20001

$1,000,000

2
Bedrooms
1,887
Square Feet

440 R Street Northwest, Unit 203, Washington, DC 20001

$990,000 | 1010 K Street Northeast, Washington, DC 20002

$990,000

4
Bedrooms
0.03
Acres

1010 K Street Northeast, Washington, DC 20002

$987,500 | 1302 R Street Northwest, Unit 1, Washington, DC 20009

$987,500

2
Bedrooms
1,420
Square Feet

1302 R Street Northwest, Unit 1, Washington, DC 20009

$975,000 | 3601 Connecticut Avenue Northwest, Unit 610, Washington, DC 20008

$975,000

2
Bedrooms
1,700
Square Feet

3601 Connecticut Avenue Northwest, Unit 610, Washington, DC 20008

$970,000 | 4100 Cathedral Avenue Northwest, Unit 508, Washington, DC 20016

$970,000

3
Bedrooms
1,905
Square Feet

4100 Cathedral Avenue Northwest, Unit 508, Washington, DC 20016

a city view with tall buildings

$961,000

2
Bedrooms
1,700
Square Feet

3601 Connecticut Avenue Northwest, Unit 410, Washington, DC 20008

$960,000

2
Bedrooms
1,700
Square Feet

3601 Connecticut Avenue Northwest, Unit 621, Washington, DC 20008

$940,000 | 3601 Connecticut Avenue Northwest, Unit 621, Washington, DC 20008

$940,000

2
Bedrooms
1,700
Square Feet

3601 Connecticut Avenue Northwest, Unit 621, Washington, DC 20008

Past Rentals
a living room with furniture and flowers

$3,150

1
Bedrooms
739
Square Feet

1311 13th Street Northwest, Unit 602, Washington, DC 20005

$3,100 | 1311 13th Street Northwest, Unit #PH2 (602), Washington, DC 20005

$3,100

1
Bedrooms
739
Square Feet

1311 13th Street Northwest, Unit #PH2 (602), Washington, DC 20005

$2,950 | 2201 L Street Northwest, Unit 819, Washington, DC 20037

$2,950

Studio
Bedrooms
510
Square Feet

2201 L Street Northwest, Unit 819, Washington, DC 20037