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

a front view of a residential apartment building with a yard
a view of an entryway with wooden floor
front view of a house with a tree
a view of a patio with swimming pool
a view of a patio with a dining table and chairs potted plants
a front view of a residential apartment building
a view of a bedroom from a hallway
a view of a dining room with furniture
a view of storage and utility room with washer and dryer
a view of a dining room with furniture and wooden floor
a view of a kitchen with wooden floor and electronic appliances
a kitchen with stainless steel appliances a refrigerator stove and microwave
a kitchen with stainless steel appliances a refrigerator sink and microwave
a kitchen with stainless steel appliances a stove a sink and a microwave
a living room with furniture and a wooden floor
a living room with furniture kitchen view and a fireplace
a living room with furniture and a table
a living room with furniture and a fireplace
a living room with furniture and a fireplace
a living room with furniture a fireplace and a table
a living room with furniture and a flat screen tv
a living room with furniture and a fireplace
a view of a fireplace with wooden floor
a view of a livingroom with wooden floor and stairs
a dining room with furniture and a potted plant
a dining room with furniture and a mirror
a view of a hallway with entryway wooden floor and front door
a bedroom with a bed a mirror and a large window
a living room with furniture and a window
a view of store room
a bathroom with a sink a toilet and shower
a bathroom with a glass door shower
a bedroom with a bed and wooden floor
a bedroom with a bed and a flat screen tv
a bed room with a bed and a painting
a bathroom with a bathtub and a sink
a bathroom with a sink toilet and shower
a close up of a bathtub curtain
a utility room with dryer and washer
a view of entryway and hall with wooden floor
a view of staircase with white walls and a window
a view of a patio with couches chairs and a table
a view of a patio with a table and chairs
a view of a balcony with chairs and a table
a roof deck with couches and potted plants
a view of city with tall buildings
a view of a city from a balcony
a view of a terrace with seating area
a view of a patio with a table and chairs and potted plants
a outdoor space with patio couches and a table
$829,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$829,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$829,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$829,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$829,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$829,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$829,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$829,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$829,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$829,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$829,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$829,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$829,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$829,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$829,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
$829,000 | 1126 5th Street Northwest, Unit 4, Washington, DC 20001
1/66
Listed By CompassVirtual Tour

$829,000

2
Bedrooms
955
Square Feet

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

$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
$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
$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
$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
$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
$469,000 | 3601 Connecticut Avenue Northwest, Unit 107, Washington, DC 20008
1/46
Listed By Compass

$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