ZIP Code 20877 — Gaithersburg, MD Home Prices (2026)

The typical home in ZIP 20877 (Gaithersburg, Maryland) is worth about $477,000 at roughly $261 per square foot — 18% more affordable than the Gaithersburg median and 62% more expensive than the typical U.S. home.

$477,000

Typical home value

$261

Price per sq ft

#3 of 4

Gaithersburg ZIPs by value

-18%

vs Gaithersburg median

How 20877 compares

ZIP 20877 is one of the more affordable ZIP codes in Gaithersburg: its typical home value of $477,000 ranks #3 of the 4 Gaithersburg ZIP codes we track (the citywide range runs from $443,000 in 20879 to $803,000 in 20882). Per square foot it costs about $261, against $254 for Gaithersburg as a whole, $233 for Maryland, and $195 nationally.

Area	Typical value	$ / sq ft
ZIP 20877	$477,000	$261
Gaithersburg, MD	$584,500	$254
Maryland	$451,500	$233
United States	$294,000	$195

Home value by size in 20877

Using this ZIP’s rate of about $261 per square foot. Condition, lot, and the exact street move these meaningfully — use the estimator below for a home-specific figure.

Home size	Estimated value
1,000 sq ft	$261,000
1,500 sq ft	$391,500
2,000 sq ft	$522,000
2,500 sq ft	$652,500
3,000 sq ft	$783,000

Salary needed to buy a home in ZIP 20877

To buy the typical $477,000 home in ZIP 20877 with 20% down, you need a household income of roughly $130,000 a year (about $3,030 a month for the mortgage, taxes, and insurance). With 10% down the bar rises to about $154,000, because the loan is bigger and mortgage insurance kicks in.

Down payment	Cash down	Monthly payment	Income needed
5% (+PMI)	$23,900	$3,760/mo	$161,000/yr
10% (+PMI)	$47,700	$3,600/mo	$154,000/yr
20%	$95,400	$3,030/mo	$130,000/yr

Assumes a 30-year fixed mortgage at 6.5%, property tax at 1.1% and insurance at 0.45% of value per year, PMI of 0.75% on loans with less than 20% down, and the standard 28% housing-to-income rule. Your rate, taxes, and HOA will move these — run your own numbers in the mortgage calculator.

What your budget buys in ZIP 20877

At about $261 per square foot, here is roughly how much home different budgets get you in ZIP 20877:

Budget	Approx. size	What that looks like locally
$250k	960 sq ft	below the local median — condos, smaller or older homes
$300k	1150 sq ft	below the local median — condos, smaller or older homes
$400k	1530 sq ft	around the typical home here
$500k	1920 sq ft	around the typical home here
$600k	2300 sq ft	around the typical home here

Wondering where that budget goes further? The relocation calculator ranks hundreds of U.S. cities by what the same money buys — it opens pre-filled with a typical 20877 home.

Estimate a specific home in 20877

The estimator below is pre-set to ZIP 20877 — pick your home’s size for an instant ballpark, then open the full calculator to adjust beds, baths, and condition.

All Gaithersburg ZIP codes by home value

Where 20877 sits among Gaithersburg’s 4 ZIP codes:

#	ZIP code	Typical value	$ / sq ft
1	20882	$803,000	$245
2	20878	$692,000	$305
3	20877 (this page)	$477,000	$261
4	20879	$443,000	$247

ZIP 20877 home prices: frequently asked

What is the average home price in ZIP code 20877? +

The typical home in ZIP 20877 (Gaithersburg, MD) is worth about $477,000 as of 2026. That is 18% more affordable than the Gaithersburg median of $584,500 and 62% more expensive than the U.S. median of $294,000.

What is the price per square foot in 20877? +

About $261 per square foot in 20877, versus $254 across Gaithersburg and $233 across Maryland. At that rate a 1,500 sq ft home runs roughly $391,500 and a 2,500 sq ft home about $652,500.

What salary do you need to buy a house in ZIP 20877? +

For the typical $477,000 home in ZIP 20877, a household income of about $130,000 a year covers the payment with 20% down (a 30-year fixed at 6.5%, plus taxes and insurance, under the 28% rule). With 10% down you need roughly $154,000; with 5% down about $161,000.

Is 20877 an expensive ZIP code? +

Within Gaithersburg, 20877 ranks #3 of 4 ZIP codes by typical home value, which makes it one of the more affordable ZIP codes in Gaithersburg. Nationally it is relatively expensive.

See the full Gaithersburg home values page, all Maryland cities, or price per square foot by ZIP code nationwide.

Directional estimates from public market data (Realtor.com & Zillow research), not appraisals. A single ZIP contains very different homes; actual values vary and change over time.