ZIP 20815

20815 is one of 48 ZIP codes that lie mostly in Montgomery County, MD.

Shaded by typical home value, it ranks 6 of the 36 nearby ZIPs shown.

4 school locations in 20815: 4 elementary.

In alphabetical order: Chevy Chase Elementary, North Chevy Chase Elementary, Rock Creek Forest Elementary, Somerset Elementary. Locations only — no ratings are shown here.

In January 2000 the typical home in 20815 was worth $362,519.

Values peaked at $1,161,700 in May 2025. The latest reading is −1.2% from that peak.

As of August 2026: $1,147,961, +0.4% over twelve months.

Start with the typical home: $1,147,961. Put 20% down and borrow $918,369 at 7.40%, the 30-year fixed average as of October 8, 2026.

That is $6,359 a month in principal and interest.

The median household here earns $198,243 a year, $16,520 a month. So the payment takes 38.5% of income — rated “severe” (Lotvox ZIP bands: under 28% affordable · 28–36% stretched · 36%+ severe).

The line holds today's rate fixed and moves only the price: at that rate, the same share was 12.2% in 2000.

Take the typical home's price each month, borrow 80% at that month's actual 30-year average rate: in January 2000 (8.21%) the payment was $2,171.

In December 2020, with rates at 2.68%, it was $3,004.

By August 2026, at 6.67%, it was $5,906 — +97% since December 2020, while the home's value moved +24%.

Reported values rose +217% since January 2000.

General prices (CPI-U) rose +97% over the same span.

Divide one by the other: in August 2026 dollars, the 2000 home was worth $715,469. So the real change is +60%, not +217%.

20815: +217% since January 2000.

Montgomery County: +182% since January 2000.

Maryland: +180% since January 2000 — 20815 ran ahead of it by 36 points.

Owning the typical home costs about $7,507 a month once taxes and insurance (estimated at 1.2% of price a year) are added. Renting runs about $2,780 a month.

Price divided by a year's rent: 34.4. Lotvox reads under 15 as favoring buying and 20 or more as favoring renting.

Picture the Listings Flow Ladder as a basin: new listings pour in from the faucet, the homes for sale are the water, and closed sales run out the drain. Coming in — new listings: about 42 a month (Redfin, 3-month rolling data through August 2026). That is 98% of the 2015–2019 level for the same months.

On the shelf — homes for sale at the end of the period: 121.

Going out — closed sales: about 41 a month. That is 90% of the 2015–2019 level for the same months. The drain is drawn 18% narrower: the share of homes for sale that sell each month is 82% of its 2015–2019 level.

The ladder: homes for sale ÷ monthly sales = 3.0 months of supply — below the 4–6 month range Lotvox treats as balanced. In the basin, that is the water level against the shaded balanced band.

The net reading: about 1 more homes came on than sold each month, so inventory is growing. The basin is filling.

Homes sold: about 41 a month in August 2026 (Redfin).

The 2015–2019 level for the same month was 35 — so sales ran at 117% of it, and below it in 16 of the last 24 months.

Across Montgomery County, builders pulled permits for 1,411 new homes in 2025.

Of those, 57% were in 1-unit buildings (the Census Bureau's category for detached and attached single homes).

This ZIP sits in Montgomery County. IRS tax returns for 2022-2023: among the ten counties sending the most households, 12,327 moved in. Among the ten receiving the most, 15,047 moved out.

Net across those counties: −2,720 households. Beside it, homes for sale in this ZIP: 121 in June 2026.

Most arrivals came from Prince George's, MD (3,735 households); most departures went to Prince George's, MD (3,823).

County assessor records list 61 properties with a market value here. Their average assessed market value is $671,200; the typical home value is $1,147,961.

The assessor average sits −41.5% from the market figure — an average against a typical value, so treat it as a check, not a verdict.