ZIP Code 20878 — Gaithersburg, MD Home Prices (2026)

The typical home in ZIP 20878 (Gaithersburg, Maryland) is worth about $692,000 at roughly $305 per square foot — 18% more expensive than the Gaithersburg median and 135% more expensive than the typical U.S. home.

$692,000

Typical home value

$305

Price per sq ft

#2 of 4

Gaithersburg ZIPs by value

+18%

vs Gaithersburg median

How 20878 compares

ZIP 20878 is one of the pricier ZIP codes in Gaithersburg: its typical home value of $692,000 ranks #2 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 $305, against $254 for Gaithersburg as a whole, $233 for Maryland, and $195 nationally.

Area	Typical value	$ / sq ft
ZIP 20878	$692,000	$305
Gaithersburg, MD	$584,500	$254
Maryland	$451,500	$233
United States	$294,000	$195

Home value by size in 20878

Using this ZIP’s rate of about $305 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	$305,000
1,500 sq ft	$457,500
2,000 sq ft	$610,000
2,500 sq ft	$762,500
3,000 sq ft	$915,000

Salary needed to buy a home in ZIP 20878

To buy the typical $692,000 home in ZIP 20878 with 20% down, you need a household income of roughly $188,000 a year (about $4,390 a month for the mortgage, taxes, and insurance). With 10% down the bar rises to about $224,000, because the loan is bigger and mortgage insurance kicks in.

Down payment	Cash down	Monthly payment	Income needed
5% (+PMI)	$34,600	$5,460/mo	$234,000/yr
10% (+PMI)	$69,200	$5,220/mo	$224,000/yr
20%	$138,400	$4,390/mo	$188,000/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 20878

At about $305 per square foot, here is roughly how much home different budgets get you in ZIP 20878:

Budget	Approx. size	What that looks like locally
$400k	1310 sq ft	below the local median — condos, smaller or older homes
$500k	1640 sq ft	below the local median — condos, smaller or older homes
$600k	1970 sq ft	around the typical home here
$750k	2460 sq ft	around the typical home here
$1.00M	3280 sq ft	above the median — larger homes or the pricier ZIPs

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 20878 home.

Estimate a specific home in 20878

The estimator below is pre-set to ZIP 20878 — 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 20878 sits among Gaithersburg’s 4 ZIP codes:

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

ZIP 20878 home prices: frequently asked

What is the average home price in ZIP code 20878? +

The typical home in ZIP 20878 (Gaithersburg, MD) is worth about $692,000 as of 2026. That is 18% more expensive than the Gaithersburg median of $584,500 and 135% more expensive than the U.S. median of $294,000.

What is the price per square foot in 20878? +

About $305 per square foot in 20878, versus $254 across Gaithersburg and $233 across Maryland. At that rate a 1,500 sq ft home runs roughly $457,500 and a 2,500 sq ft home about $762,500.

What salary do you need to buy a house in ZIP 20878? +

For the typical $692,000 home in ZIP 20878, a household income of about $188,000 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 $224,000; with 5% down about $234,000.

Is 20878 an expensive ZIP code? +

Within Gaithersburg, 20878 ranks #2 of 4 ZIP codes by typical home value, which makes it one of the pricier 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.