Area Code Details for: 303
Location
State
Colorado
Country
US
Map
Details
State | Colorado (CO) |
Time Zone | |
Parent NPA | - |
Relief Planning in ProgressArea code relief planning is the process of addressing the exhaustion of available telephone numbers within an area code. When the supply of numbers in an existing area code is running low, NANPA works with the telecommunications industry to introduce new area codes. | No |
In Service Date | January 1, 1947 |
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Cities
| Zipcode | City | County |
|---|---|---|
| 80108 | Castle Rock, CO | Douglas |
| 80109 | Castle Rock, CO | Douglas |
| 80110 | Englewood, CO | Arapahoe |
| 80105 | Deer Trail, CO | Arapahoe |
| 80106 | Elbert, CO | El Paso |
| 80107 | Elizabeth, CO | Elbert |
| 80111 | Englewood, CO | Arapahoe |
| 80117 | Kiowa, CO | Elbert |
| 80118 | Larkspur, CO | Douglas |
| 80120 | Littleton, CO | Arapahoe |
| 80112 | Englewood, CO | Arapahoe |
| 80113 | Englewood, CO | Arapahoe |
| 80116 | Franktown, CO | Douglas |
| 80104 | Castle Rock, CO | Douglas |
| 80038 | Broomfield, CO | Broomfield |
| 80040 | Aurora, CO | Adams |
| 80041 | Aurora, CO | Arapahoe |
| 80035 | Westminster, CO | Adams |
| 80036 | Westminster, CO | Adams |
| 80037 | Commerce City, CO | Adams |
| 80042 | Aurora, CO | Adams |
| 80047 | Aurora, CO | Arapahoe |
| 80102 | Bennett, CO | Adams |
| 80103 | Byers, CO | Arapahoe |
| 80044 | Aurora, CO | Arapahoe |
| 80045 | Aurora, CO | Adams |
| 80046 | Aurora, CO | Arapahoe |
| 80510 | Allenspark, CO | Larimer |
| 80504 | Longmont, CO | Weld |
| 80503 | Longmont, CO | Boulder |
| 80136 | Strasburg, CO | Adams |
| 80137 | Watkins, CO | Adams |
| 80138 | Parker, CO | Douglas |
| 80502 | Longmont, CO | Boulder |
| 80475 | Shawnee, CO | Park |
| 80474 | Rollinsville, CO | Gilpin |
| 80471 | Pinecliffe, CO | Boulder |
| 80501 | Longmont, CO | Boulder |
| 80481 | Ward, CO | Boulder |
| 80476 | Silver Plume, CO | Clear Creek |
| 80135 | Sedalia, CO | Douglas |
| 80124 | Lone Tree , CO | Douglas |
| 80124 | Littleton, CO | Douglas |
| 80125 | Littleton, CO | Douglas |
| 80121 | Littleton, CO | Arapahoe |
| 80122 | Littleton, CO | Arapahoe |
| 80123 | Littleton, CO | Jefferson |
| 80126 | Littleton, CO | Douglas |
| 80130 | Littleton, CO | Douglas |
| 80131 | Louviers, CO | Douglas |
| 80134 | Parker, CO | Douglas |
| 80127 | Littleton, CO | Jefferson |
| 80128 | Littleton, CO | Jefferson |
| 80129 | Littleton, CO | Douglas |
| 80643 | Keenesburg, CO | Weld |
| 80642 | Hudson, CO | Weld |
| 80640 | Henderson, CO | Adams |
| 80749 | Sedgwick, CO | Sedgwick |
| 80732 | Hereford, CO | Weld |
| 80652 | Roggen, CO | Weld |
| 80621 | Fort Lupton, CO | Weld |
| 80602 | Brighton, CO | Adams |
| 80601 | Brighton, CO | Adams |
| 80544 | Niwot, CO | Boulder |
| 80614 | Eastlake, CO | Adams |
| 80603 | Lochbuie, CO | Weld |
| 80603 | Brighton , CO | Weld |
| 80001 | Arvada, CO | Jefferson |
| 80011 | Aurora, CO | Adams |
| 80006 | Arvada, CO | Jefferson |
| 80005 | Arvada, CO | Jefferson |
| 80010 | Aurora, CO | Arapahoe |
| 80007 | Arvada, CO | Jefferson |
| 80011 | Aurora , CO | Arapahoe |
| 80004 | Arvada, CO | Jefferson |
| 80014 | Aurora, CO | Arapahoe |
| 80013 | Aurora, CO | Arapahoe |
| 80012 | Aurora, CO | Arapahoe |
| 80003 | Arvada, CO | Jefferson |
| 80002 | Arvada, CO | Jefferson |
| 80015 | Aurora, CO | Arapahoe |
| 80023 | Broomfield , CO | Broomfield |
| 80023 | Westminster, CO | Broomfield |
| 80024 | Dupont, CO | Adams |
| 80021 | Broomfield, CO | Jefferson |
| 80021 | Westminster, CO | Broomfield |
| 80022 | Commerce City, CO | Adams |
| 80025 | Eldorado Springs, CO | Boulder |
| 80031 | Westminster, CO | Adams |
| 80033 | Wheat Ridge, CO | Jefferson |
| 80034 | Wheat Ridge, CO | Jefferson |
| 80026 | Lafayette, CO | Boulder |
| 80027 | Louisville, CO | Boulder |
| 80030 | Westminster, CO | Adams |
| 80021 | Broomfield , CO | Jefferson |
| 80520 | Firestone, CO | Weld |
| 80516 | Frederick, CO | Boulder |
| 80516 | Erie , CO | Boulder |
| 80540 | Lyons, CO | Boulder |
| 80533 | Hygiene, CO | Boulder |
| 80530 | Frederick, CO | Weld |
| 80514 | Dacono, CO | Weld |
| 80019 | Aurora, CO | Adams |
| 80020 | Broomfield , CO | Broomfield |
| 80020 | Westminster, CO | Broomfield |
| 80016 | Aurora, CO | Arapahoe |
| 80017 | Aurora, CO | Arapahoe |
| 80018 | Aurora, CO | Arapahoe |
| 80470 | Pine, CO | Jefferson |
| 80219 | Denver, CO | Denver |
| 80220 | Denver, CO | Denver |
| 80221 | Denver, CO | Adams |
| 80271 | Denver, CO | Denver |
| 80266 | Denver, CO | Denver |
| 80265 | Denver, CO | Denver |
| 80222 | Denver, CO | Denver |
| 80226 | Denver, CO | Jefferson |
| 80227 | Denver , CO | Jefferson |
| 80227 | Lakewood, CO | Jefferson |
| 80223 | Denver, CO | Denver |
| 80224 | Denver, CO | Denver |
| 80225 | Denver, CO | Jefferson |
| 80273 | Denver, CO | Denver |
| 80303 | Boulder, CO | Boulder |
| 80302 | Boulder, CO | Boulder |
| 80301 | Boulder, CO | Boulder |
| 80218 | Denver, CO | Denver |
| 80305 | Boulder, CO | Boulder |
| 80304 | Boulder, CO | Boulder |
| 80299 | Denver, CO | Denver |
| 80290 | Denver, CO | Denver |
| 80281 | Denver, CO | Denver |
| 80274 | Denver, CO | Denver |
| 80294 | Denver, CO | Denver |
| 80293 | Denver, CO | Denver |
| 80291 | Denver, CO | Denver |
| 80263 | Denver, CO | Denver |
| 80264 | Denver, CO | Denver |
| 80256 | Denver, CO | Denver |
| 80259 | Denver, CO | Denver |
| 80260 | Denver, CO | Adams |
| 80261 | Denver, CO | Denver |
| 80250 | Denver, CO | Denver |
| 80246 | Denver, CO | Denver |
| 80243 | Denver, CO | Denver |
| 80241 | Thornton, CO | Adams |
| 80249 | Denver, CO | Denver |
| 80248 | Denver, CO | Denver |
| 80247 | Denver, CO | Arapahoe |
| 80257 | Denver, CO | Denver |
| 80231 | Denver, CO | Denver |
| 80232 | Denver, CO | Jefferson |
| 80233 | Denver, CO | Adams |
| 80228 | Denver, CO | Jefferson |
| 80229 | Denver, CO | Adams |
| 80230 | Denver, CO | Denver |
| 80234 | Denver, CO | Adams |
| 80237 | Denver, CO | Denver |
| 80238 | Denver, CO | Denver |
| 80239 | Denver, CO | Denver |
| 80235 | Denver , CO | Jefferson |
| 80235 | Lakewood, CO | Jefferson |
| 80236 | Denver, CO | Denver |
| 80422 | Black Hawk, CO | Gilpin |
| 80421 | Bailey, CO | Park |
| 80419 | Golden, CO | Jefferson |
| 80427 | Central City, CO | Gilpin |
| 80425 | Buffalo Creek, CO | Jefferson |
| 80423 | Bond, CO | Eagle |
| 80403 | Golden, CO | Jefferson |
| 80310 | Boulder, CO | Boulder |
| 80309 | Boulder, CO | Boulder |
| 80308 | Boulder, CO | Boulder |
| 80402 | Golden, CO | Jefferson |
| 80401 | Golden, CO | Jefferson |
| 80314 | Boulder, CO | Boulder |
| 80433 | Conifer, CO | Jefferson |
| 80457 | Kittredge, CO | Jefferson |
| 80465 | Morrison, CO | Jefferson |
| 80452 | Idaho Springs, CO | Clear Creek |
| 80454 | Indian Hills, CO | Jefferson |
| 80455 | Jamestown, CO | Boulder |
| 80453 | Idledale, CO | Jefferson |
| 80448 | Grant, CO | Park |
| 80466 | Nederland, CO | Boulder |
| 80437 | Evergreen, CO | Jefferson |
| 80436 | Dumont, CO | Clear Creek |
| 80444 | Georgetown, CO | Clear Creek |
| 80439 | Evergreen, CO | Jefferson |
| 80438 | Empire, CO | Clear Creek |
| 80215 | Denver, CO | Jefferson |
| 80214 | Denver, CO | Jefferson |
| 80212 | Denver, CO | Denver |
| 80217 | Denver, CO | Denver |
| 80204 | Denver, CO | Denver |
| 80216 | Denver, CO | Denver |
| 80211 | Denver, CO | Denver |
| 80209 | Denver, CO | Denver |
| 80207 | Denver, CO | Denver |
| 80208 | Denver, CO | Denver |
| 80205 | Denver, CO | Denver |
| 80206 | Denver, CO | Denver |
| 80210 | Denver, CO | Denver |
| 80203 | Denver, CO | Denver |
| 80155 | Englewood, CO | Arapahoe |
| 80160 | Littleton, CO | Arapahoe |
| 80161 | Littleton, CO | Arapahoe |
| 80151 | Englewood, CO | Arapahoe |
| 80307 | Boulder, CO | Boulder |
| 80306 | Boulder, CO | Boulder |
| 80150 | Englewood, CO | Arapahoe |
| 80162 | Littleton, CO | Jefferson |
| 80202 | Denver, CO | Denver |
| 80201 | Denver, CO | Denver |
| 80166 | Littleton, CO | Arapahoe |
| 80163 | Littleton, CO | Douglas |
| 80165 | Littleton, CO | Arapahoe |
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