ZIP 80109
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12-month history
Last updated: October 17, 2026
What the numbers show
December. Asking rents in ZIP 80109 usually run 1.3% below trend in December and 1.3% above it in September, about $68 a month apart at today's median. Based on 8 years of data.
Rent in ZIP 80109 is at its highest level since Zillow's records here began in January 2018.
Rent in ZIP 80109 changed +4.2% over the year to September 2026. Across the 155 Colorado ZIP codes Zillow tracks, the typical change was +1.3%.
From 2019 to 2024, rent in ZIP 80109 rose 29.8% while median household income rose 23.6% ($125,417 to $155,025). Rent outpaced income.
Rent in ZIP 80109 is 37% higher than in March 2020. Across the US, rent is up 37.3% over the same stretch.
Rent has risen 2 months in a row, and rose in 9 of the last 12 months.
30% of the median household income ($155,025) is $3,876 a month. That covers HUD's Fair Market Rent for up to a 4-bedroom ($3,720).
ZIP 80108, 6 miles away, rents for 13% less ($2,297/mo), about $4,000 a year in savings.
From Zillow's monthly rent index (ZORI) for ZIP 80109. The seasonal pattern compares Zillow’s seasonally adjusted and unadjusted series. Income is the Census median household income (5-year estimates). Fair Market Rents are HUD’s, which include utilities.
Who lives here
ZIP 80109 (Castle Rock, CO) is majority owner-occupied, has a large share of families with children, has a median income above the national average, 57.8% of residents hold a bachelor's degree or higher.
Source: U.S. Census Bureau · ACS 2024 5-Year Estimates
How ZIP 80109 in Castle Rock, CO has changed in 5 years
Rent in ZIP 80109 in Castle Rock, CO has climbed 27.6% since 2021, going from about $2,061 per month to roughly $2,629 today. Median household income grew from $130,296 to $155,025 between 2021 and 2024, a 19.0% shift. Rent outpaced income growth by roughly 8.6 percentage points, which means renters are spending a larger slice of each paycheck on housing than they did in 2021. Headcount in the area went from 27,187 to 28,400 between 2021 and 2024, a 4.5% change. Taken together, the five-year picture in ZIP 80109 in Castle Rock, CO reflects how housing costs and the people paying them have evolved through a stretch that included a pandemic, a hot rental market, and a recent cooling phase.
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Tips for renters in ZIP 80109
Last updated: October 17, 2026
ZIP code 80109 covers Castle Rock, CO. The median rent here is $2,629/mo as of October 2026. A 1-bedroom rents for a median of $2,140/mo. A 2-bedroom rents for a median of $2,550/mo.
At 20% of local median household income ($155,025/yr), ZIP 80109 ranks as affordable compared to the national benchmark of 30%. Rents have increased 4.2% over the past year.
Frequently asked questions
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How does ZIP 80109 compare to the rest of Castle Rock?
At $2,629/mo, rent takes ~20% of ZIP 80109's median household income ($155,025/yr). The standard benchmark is 30%.
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