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Area Code 303Area Code 303 is in Colorado and covers 6697.11 square miles. Area Code 303 contains 59 non-unique postal area zip codes. |
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| Area Code 303 Zipcodes | |
| 80530 Frederick, CO |  |
| 80220 Denver, CO | |
| 80225 Denver, CO | |
| 80004 Arvada, CO | |
| 80003 Arvada, CO | |
| 80007 Arvada, CO | |
| 80017 Aurora, CO | |
| 80019 Aurora, CO | |
| 80107 Elizabeth, CO | |
| 80109 Castle Rock, CO | |
| 80113 Englewood, CO | |
| 80121 Littleton, CO | |
| 80123 Littleton, CO | |
| 80126 Littleton, CO | |
| 80135 Sedalia, CO | |
| 80136 Strasburg, CO | |
| 80138 Parker, CO | |
| 80203 Denver, CO | |
| 80206 Denver, CO | |
| 80209 Denver, CO | |
| 80211 Denver, CO | |
| 80212 Denver, CO | |
| 80226 Denver, CO | |
| 80231 Denver, CO | |
| 80234 Denver, CO | |
| 80235 Denver, CO | |
| 80236 Denver, CO | |
| 80237 Denver, CO | |
| 80241 Thornton, CO | |
| 80260 Denver, CO | |
Adjacent Area Codes:
| Area Code 719 | Area Code 720 | Area Code 970 |
| 80262 Denver, CO |
| 80304 Boulder, CO |
| 80309 Boulder, CO |
| 80401 Golden, CO |
| 80455 Jamestown, CO |
| 80504 Longmont, CO |
| 80514 Dacono, CO |
| 80603 Brighton, CO |
| 80118 Larkspur, CO |
| 80520 Firestone, CO |
| 80652 Roggen, CO |
| 80642 Hudson, CO |
| 80452 Idaho Springs, CO |
| 80249 Denver, CO |
| 80501 Longmont, CO |
| 80214 Denver, CO |
| 80223 Denver, CO |
| 80227 Denver, CO |
| 80021 Broomfield, CO |
| 80022 Commerce City, CO |
| 80466 Nederland, CO |
| 80403 Golden, CO |
| 80439 Evergreen, CO |
| 80470 Pine, CO |
| 80110 Englewood, CO |
| 80302 Boulder, CO |
| 80222 Denver, CO |
| 80106 Elbert, CO |
| 80102 Bennett, CO |
data sources: