3639 21st St
Boulder, CO 80304
6 bd 6 ba 7,982 sqft Built 2007 Lot 29,621 sqft single_family
No recorded sales
Location
Timeline: Sale, Listing & Tax History
Recorded events
No recorded events
No sale or listing events are on file for this property.
Tax assessment history
| Year | Building | Land | Total assessed | Tax paid |
|---|---|---|---|---|
| 2025 | $343,338 | $71,763 | $415,101 | $39,579 |
| 2024 | $343,338 | $71,763 | $415,101 | $27,788 |
| 2023 | $329,365 | $74,953 | $404,318 | $34,598 |
| 2022 | $263,662 | $59,944 | $323,606 | $30,051 |
| 2021 | $271,250 | $61,669 | $332,919 | $28,656 |
| 2020 | $171,664 | $114,472 | $286,136 | $24,906 |
| 2019 | $171,664 | $114,472 | $286,136 | $24,525 |
| 2018 | $166,795 | $111,168 | $277,963 | $24,099 |
| 2017 | $166,795 | $111,168 | $277,963 | $23,345 |
| 2016 | $137,843 | $91,858 | $229,701 | $19,884 |
| 2015 | $137,843 | $91,858 | $229,701 | $18,829 |
| 2014 | $160,144 | $54,606 | $214,750 | $18,463 |
| 2013 | $160,144 | $54,606 | $214,750 | $18,056 |
| 2011 | $178,304 | $38,447 | $216,751 | $17,997 |
| 2010 | $178,304 | $38,447 | $216,751 | $13,900 |
| 2009 | $178,304 | $38,447 | $216,751 | $12,979 |
| 2008 | $42,200 | $43,780 | $85,980 | $6,323 |
Property facts
Year built
2007
Property type
single_family
Stories
2
Beds
6
Baths
6
Living area
7,982 sqft
Lot size
29,621 sqft
ZIP code
80304
City
Boulder
Street
21st St
Coordinates
40.04170, -105.27091
Comparable properties nearby
Frequently asked questions
When did 3639 21st St last sell?
No public-record sale is on file for 3639 21st St.
What is the current tax assessment for 3639 21st St?
The most recent total assessment for 3639 21st St (year 2025) is $415,101 with $39,579 in property tax.
When was 3639 21st St built?
3639 21st St was built in 2007.
How does 3639 21st St compare to others on 21st St?
We track 8 other properties on 21st St. Browse the list under "Other properties on 21st St" to compare beds, baths, and sale history.
What are the property facts for 3639 21st St?
3639 21st St is a 6 bed, 6 bath, 7,982 sqft, 29,621 sqft lot single_family.
Is 3639 21st St a flip candidate?
No — 3639 21st St does not appear in our flips dataset.
Is 3639 21st St a tax-appeal candidate?
No — 3639 21st St is not currently flagged as a tax-appeal candidate.
Forecast for this area
ZIP-area linear projection — not a per-property automated valuationQuarterly trend
+1.2%
Implied 1-yr
+5.0%
2026 Q3
$2.17M
2026 Q4
$2.2M
ZIP 80304 — Median Price History + Forecast
Explore nearby
Geography
Other properties on 21st St