Google street view image for 3 Keystone Ct, Gaithersburg, MD 20878

Off market sep 1979 for $99K

$647,592

Est. refi paymentEst. refi $682/mo

—

•

3 ba

•

2,156

sq ft

3 Keystone Ct, Gaithersburg, MD 20878

About this home

3 Keystone Ct is a 2,156 square foot house on a 10,585 square foot lot with 3 bathrooms. - it last sold on September 18, 1979 for $99,500. Based on Redfin's Gaithersburg data, we estimate the home's value is $647,592.

Single-familyProperty Type

1974Year Built

10,585 sq ftLot Size

$300Est. Price/Sq.Ft.

Source:Public Records

Redfin Estimate

$647,592

$548K since sold in September 1979$19K since September

Recently sold homes
Estimate history
Homes for sale

This home's estimate is 6.5% lower than the average sale price ($692K) of 5 comparable homes.

SOLD JUL 14, 2026
$773,580
A
4 beds3 baths2,156 sq ft
852 Diamond Dr, Gaithersburg, MD 20878
SOLD AUG 26, 2026
$625,000
B
3 beds3 baths1,902 sq ft
11937 Bayswater Rd, Gaithersburg, MD 20878
SOLD APR 30, 2026
$753,000
C
4 beds3 baths2,156 sq ft
823 Diamond Dr, Gaithersburg, MD 20878
SOLD SEP 1, 2026
$695,250
D
4 beds2.5 baths2,252 sq ft
16716 Sioux Ln, Gaithersburg, MD 20878
SOLD APR 30, 2026
$615,000
E
3 beds3 baths1,714 sq ft
11924 Fernshire Rd, Gaithersburg, MD 20878

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Earn from this home

Sell

$608,335

Est. take-home

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Refinance

Est. cash available

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Market trends in 20878, MD

Last updated September 2026

Buyer's Market

Seller's Market

Seller's market

Sale-to-List Price

99.6%

0.3% MoM

Median sale price

$795K

$344 MoM

Avg. days on market

39d

5 days MoM

Recently sold homes

192

17 MoM

New listings for sale

NEW 5 HRS AGO
$684,999
3 beds2.5 baths2,400 sq ft
419 Parkview Ave, Gaithersburg, MD 20866
(202) 537-3800
NEW 8 HRS AGO
$399,000
2 beds2.5 baths1,420 sq ft
7 Booth St #110, Gaithersburg, MD 20878
(301) 615-3000
COMING SOON
$874,900
3 beds3 baths3,100 sq ft
542 Market St E, Gaithersburg, MD 20878
(301) 615-3000
NEW 1 DAY AGO
$1,599,900
5 beds4.5 baths4,651 sq ft
132 Treehaven St, Gaithersburg, MD 20878
(301) 602-3904
NEW 1 DAY AGO
$565,000
3 beds2.5 baths1,928 sq ft
5 Lazy Hollow Way, Gaithersburg, MD 20878
(240) 683-0985
COMING SOON
$899,000
4 beds2.5 baths3,058 sq ft
12321 Triple Crown Rd, North Potomac, MD 20878
(703) 518-8300
$1,069,000
4 beds3.5 baths2,852 sq ft
11568 Paramus Dr, North Potomac, MD 20878
(301) 340-8700
COMING SOON
$532,900
3 beds2 baths1,702 sq ft
104 Bucksfield Rd #104, Gaithersburg, MD 20878
(301) 602-3904
$724,999
4 beds3 baths2,076 sq ft
12205 Horse Center Rd, North Potomac, MD 20878
(202) 944-5000
$1,025,000
4 beds3.5 baths3,238 sq ft
12004 Pineapple Grove Dr, North Potomac, MD 20878
(301) 652-0643
See all

Provided by Redfin

Sale history for 3 Keystone Ct

Year

Property tax

Land + Additions

Assessment*

2025

$6,205 (+7.3%)

$220,500 + $302,900

$523,400

2024

$5,781 (+7.6%)

2023

$5,374 (+5.5%)

2022

$5,096 (+2.3%)

$220,500 + $217,900

$438,400

2021

$4,983 (+4.1%)

2020

$4,789 (+0.9%)

2019

$4,745 (+0.6%)

$220,500 + $185,800

$406,300

2018

$4,719 (−0.6%)

2017

$4,746 (+5.1%)

$220,500 + $179,400

$399,900

2015

$4,514 (−1.0%)

$196,800 + $193,400

$390,200

2014

$4,561 (+1.7%)

2013

$4,484 (+4.2%)

2012

$4,303 (+4.4%)

2011

$4,120

2010

$4,120 (+19.1%)

2009

$3,459

Tax history for 3 Keystone Ct

Year

Property tax

Land + Additions

Assessment*

2025

$6,205 (+7.3%)

$220,500 + $302,900

$523,400

2024

$5,781 (+7.6%)

2023

$5,374 (+5.5%)

2022

$5,096 (+2.3%)

$220,500 + $217,900

$438,400

2021

$4,983 (+4.1%)

2020

$4,789 (+0.9%)

2019

$4,745 (+0.6%)

$220,500 + $185,800

$406,300

2018

$4,719 (−0.6%)

2017

$4,746 (+5.1%)

$220,500 + $179,400

$399,900

2015

$4,514 (−1.0%)

$196,800 + $193,400

$390,200

2014

$4,561 (+1.7%)

2013

$4,484 (+4.2%)

2012

$4,303 (+4.4%)

2011

$4,120

2010

$4,120 (+19.1%)

2009

$3,459

*Taxable value of land and structures on it ("additions") is determined regularly by local assessors and does not affect market price.

Zoning and permits

Zoning
Permits

R-90

Medium Density Residential District

The R-90 Zone is intended to provide for medium-density residential areas primarily with single-family detached homes.

Permitted uses

Include but are not limited to:

Religious facility
Day care facility
Housing-Single unit
Housing-Other
Public service

Property details

Interior

Bathroom Information
# of Full Baths: 3

Heating & Cooling
Air Conditioning Type: Split System
Heating Type: Hot Air

Fireplace Information
# of Fireplaces: 1
Fireplace Type: 2 Story Brick
Has Fireplace

Exterior

Exterior Information
Building Construction Quality: Average
Exterior Wall: Frame Brick
Building Type: Single Family

Property Information
Subdivision Name: WEST RIDING
Living Sq. Ft: 2,156
Building Sq. Ft: 2,504
# of Stories: 2
Stories Type: 2
Legal Description: WEST RIDING

Parking & Garage Information
Parking Type: Attached Frame Garage
Garage/Parking Sq. Ft: 348
Garage / Carport Type: Attached Frame

Lot Information
# of Buildings: 1
Land Sq. Ft: 10,585
Legal Lot Number: 52
Legal Block Number: C
Municipality Name: GAITHERSBURG
Acres: 0.243
Zoning Code: R90
County Use Description: SINGLE FAMILY DETACH
State Use Description: RESIDENTIAL

Utility Information
Sewer Type: Public

Financial

Assessor Information
Assessment Year: 2026
Tax District County: 09

Public facts

Beds: —
Baths: 3.0
Sq. Ft.: 2,156
Stories: 2.0
Lot Size: 10,585 square feet
Style: Single Family Residential
Year Built: 1974
Year Renovated: —
County: Montgomery County
APN: 09 01521473

Home facts updated by county records on Jul 17, 2026

Around this home

Schools

Diamond Elementary School

Public PreK-5 • Assigned • 0.3mi

9/10

Lakelands Park Middle School

Public 6-8 • Assigned • 1.4mi

6/10

Northwest High School

Public 9-12 • Assigned • 2.1mi

8/10

Provided by GreatSchools

Lifestyle

Provided by Walk Score and Local Logic

Local insights from Redfin agents

Gaithersburg, MD, is known for its diverse community, historic landmarks like the Gaithersburg Community Museum, and modern developments like the Kentlands. It combines a rich heritage with thriving shopping, dining, and recreational options, making...
2 months ago • Gaithersburg
Bryan Kerrigan
Redfin Premier agent
740 deals
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Climate risks

1/10 Flood Factor

Minimal risk of a flood reaching the building in the next 30 years

1/10 Fire Factor

Unlikely to be in a wildfire in next 30 years

6/10 Heat Factor

7 days above 102° expected this year, 16 days in 30 years

4/10 Wind Factor

11% chance of strong winds in next 30 years

3/10 Air Factor

2 unhealthy days expected this year, 3 days in 30 years

Provided by First Street

Historical weather

Gaithersburg, MD • 20878

Average low and high temperatures (°F)

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Sun exposure

In this area, properties receive around 9.3 hours in June and 4.1 hours in December, placing it below the U.S. average for solar exposure.

9.3 hrs

4.1 hrs

JuneDecember

Provided by Shadowmap

Estimated sale price

$616,000 – $745,000

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$724,999

4 beds3 baths2,076 sq ft

12205 Horse Center Rd, North Potomac, MD 20878

(202) 944-5000

Home values near 3 Keystone Ct

Data from public records.

Address	Redfin Estimate
16 Keystone Dr, Gaithersburg, MD 4 Beds \| 3.5 Baths \| 2608 Sq. Ft.	$721,053
10 Keystone Dr, Gaithersburg, MD 5 Beds \| 3.5 Baths \| 3316 Sq. Ft.	$756,426

Address	Redfin Estimate
14 Keystone Dr, Gaithersburg, MD - Beds \| 3.5 Baths \| 2308 Sq. Ft.	$645,937
1 Keystone Dr, Gaithersburg, MD 5 Beds \| 3 Baths \| 2756 Sq. Ft.	$736,912

Address	Redfin Estimate
12 Keystone Dr, Gaithersburg, MD 4 Beds \| 3.5 Baths \| 3126 Sq. Ft.	$748,185
5 Keystone Ct, Gaithersburg, MD 4 Beds \| 3.5 Baths \| 1908 Sq. Ft.	$703,555

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