ZIP 80503

80503 is one of 18 ZIP codes that lie mostly in Boulder County, CO — 98% of its own area is in the county.

Shaded by typical home value, it ranks 7 of the 14 with a value.

Mapped in and around 80503: 113 places to go — 42 trails, 27 parks & open space, 25 dining.

9 school locations in 80503: 5 elementary, 2 middle, 2 high.

In alphabetical order: Altona Middle School, Blue Mountain Elementary, Eagle Crest Elementary School, Hygiene Elementary School, and more on the ZIP page. Locations only — no ratings are shown here.

In January 2000 the typical home in 80503 was worth $253,332.

Values peaked at $791,784 in June 2022. The latest reading is −7.4% from that peak.

As of August 2026: $732,943, −0.2% over twelve months.

Start with the typical home: $732,943. Put 20% down and borrow $586,354 at 7.40%, the 30-year fixed average as of October 8, 2026.

That is $4,060 a month in principal and interest.

The median household here earns $118,465 a year, $9,872 a month. So the payment takes 41.1% 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 14.2% 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 $1,517.

In December 2020, with rates at 2.68%, it was $1,898.

By August 2026, at 6.67%, it was $3,771 — +99% since December 2020, while the home's value moved +25%.

Reported values rose +189% 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 $499,977. So the real change is +47%, not +189%.

80503: +189% since January 2000.

Boulder County: +213% since January 2000.

Colorado: +199% since January 2000 — 80503 ran behind it by 9 points.

Against 476 Colorado ZIP codes, 80503 sits at the 35th percentile for affordability (price vs local income).

57th for appreciation (recent value growth); 23rd for rental yield (rent vs price).

Owning the typical home costs about $4,793 a month once taxes and insurance (estimated at 1.2% of price a year) are added. Renting runs about $1,899 a month.

Price divided by a year's rent: 32.2. 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 61 a month (Redfin, 3-month rolling data through August 2026). That is 90% of the 2015–2019 level for the same months.

On the shelf — homes for sale at the end of the period: 179. That is 112% of the 2015–2019 level for the same months.

Going out — closed sales: about 46 a month. That is 81% of the 2015–2019 level for the same months. The drain is drawn 30% narrower: the share of homes for sale that sell each month is 70% of its 2015–2019 level.

The ladder: homes for sale ÷ monthly sales = 3.9 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 15 more homes came on than sold each month, so inventory is growing. The basin is filling.

Homes sold: about 46 a month in August 2026 (Redfin).

The 2015–2019 level for the same month was 53 — so sales ran at 87% of it, and below it in 16 of the last 24 months.

Across Boulder County, builders pulled permits for 2,001 new homes in 2025.

Of those, 21% were in 1-unit buildings (the Census Bureau's category for detached and attached single homes).

This ZIP sits in Boulder County. IRS tax returns for 2022-2023: among the ten counties sending the most households, 5,799 moved in. Among the ten receiving the most, 7,485 moved out.

Net across those counties: −1,686 households. Beside it, homes for sale in this ZIP: 179 in June 2026.

Most arrivals came from Denver, CO (1,036 households); most departures went to Weld, CO (1,534).

County assessor records list 12,101 properties with a market value here. Their average assessed market value is $730,300; the typical home value is $732,943.

The assessor average sits −0.4% from the market figure — an average against a typical value, so treat it as a check, not a verdict.

Of 12,613 homes with a recorded purchase date, 33% have had the same owner for 20 years or more, and 23% changed hands in the last five.

20% are owned from a different mailing address, 3% from out of state.