Every ZIP code in the United States, with weather, radar, trivia and the numbers behind it. Five digits since 1963!

ZIP stands for Zone Improvement Plan. The codes went live on July 1, 1963.The lowest ZIP code is 00501 — the IRS in Holtsville, New York.The highest ZIP code is 99950, in Ketchikan, Alaska.Type 07734 into a calculator and turn it upside down: hELLO. It is Keansburg, New Jersey.12345 belongs to one company: General Electric in Schenectady, New York.The first digit is a region: 0 is New England and New Jersey, 9 is the West Coast, Alaska and Hawaii.Mr. ZIP, the cartoon mailman, was the mascot that sold the idea to America.ZIP+4 arrived in 1983 and can narrow a ZIP down to one side of one block.A ZIP code is a mail route, not a place: plenty of them cross county and even state lines.Play ZIP Hunt: guess the secret ZIP code of the day in six tries.
zipcodes.pro — RANKINGS/CO/SMALLEST-AREA

Smallest ZIP Codes in Colorado by Land Area

What this measures. Land area of the Census tabulation area, smallest first. These are almost always dense urban ZIP codes covering a few city blocks. Source: Census Gazetteer, data release 2026-10-12.

# ZIP City County Land area
1 80293 Denver Denver 0.00 sq mi
2 80264 Denver Denver 0.01 sq mi
3 80290 Denver Denver 0.01 sq mi
4 80294 Denver Denver 0.01 sq mi
5 80024 Dupont Adams 0.02 sq mi
6 80544 Niwot Boulder 0.06 sq mi
7 80646 Lucerne Weld 0.08 sq mi
8 80419 Golden Jefferson 0.11 sq mi
9 80546 Severance Weld 0.11 sq mi
10 80266 Denver Denver 0.14 sq mi
11 81148 Romeo Conejos 0.23 sq mi
12 80826 Limon Lincoln 0.25 sq mi
13 80705 Log Lane Village Morgan 0.33 sq mi
14 81043 Hartman Prowers 0.35 sq mi
15 81030 Cheraw Otero 0.37 sq mi
16 80939 Colorado Springs El Paso 0.37 sq mi
17 81227 Monarch Chaffee 0.37 sq mi
18 80453 Idledale Jefferson 0.53 sq mi
19 80310 Boulder Boulder 0.55 sq mi
20 80131 Louviers Douglas 0.56 sq mi
21 80520 Firestone Weld 0.59 sq mi
22 80457 Kittredge Jefferson 0.62 sq mi
23 81033 Crowley Crowley 0.62 sq mi
24 81046 Hoehne Las Animas 0.62 sq mi
25 80914 Colorado Springs El Paso 0.66 sq mi
26 80623 Gilcrest Weld 0.67 sq mi
27 80471 Pinecliffe Boulder 0.72 sq mi
28 81232 Hillside Fremont 0.82 sq mi
29 80045 Aurora Adams 0.89 sq mi
30 80203 Denver Denver 1.09 sq mi
31 81221 Coal Creek Fremont 1.15 sq mi
32 80202 Denver Denver 1.16 sq mi
33 80746 Paoli Phillips 1.57 sq mi
34 80218 Denver Denver 1.58 sq mi
35 80246 Denver Denver 1.67 sq mi
36 80732 Hereford Weld 1.78 sq mi
37 81244 Rockvale Fremont 1.92 sq mi
38 81077 Swink Otero 2.21 sq mi
39 80206 Denver Denver 2.48 sq mi
40 81129 Conejos Conejos 2.61 sq mi
41 80030 Westminster Adams 2.64 sq mi
42 80230 Denver Denver 2.76 sq mi
43 80247 Denver Denver 2.91 sq mi
44 81124 Capulin Conejos 2.92 sq mi
45 80951 Colorado Springs El Paso 2.93 sq mi
46 80133 Palmer Lake El Paso 2.97 sq mi
47 80530 Frederick Weld 3.12 sq mi
48 80236 Denver Denver 3.21 sq mi
49 80224 Denver Denver 3.28 sq mi
50 80235 Denver Jefferson 3.40 sq mi

Showing the top 50 of 527 ZIP codes in Colorado that have this figure and meet the threshold above. 80293 ranks 1st at 0.00 sq mi, against 3.40 sq mi in 50th place.

Other rankings for Colorado

Cite this page

zipcodes.pro. “Smallest ZIP Codes in Colorado by Land Area.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/rankings/co/smallest-area

Underlying data is public domain or openly licensed — sources, vintages and licences.