Area codes 303 and 720

Area codes 303 and 720

The map to the right is clickable; click on an area code to go to the page for that code.
Area code 970
#poly 216 80 207 100 195 109 199 120 211 125 213 132 221 132 223 142 283 145 302 106 302 86 282 85 286 79 261 78 259 83 Area codes 303 and 720poly 378 107 356 107 350 133 342 130 342 107 324 100 300 105 283 144 224 141 221 131 212 132 211 126 198 119 195 109 179 125 178 143 193 151 198 178 181 203 165 207 164 218 149 219 149 231 166 227 168 238 186 239 195 226 205 230 211 242 200 261 376 270 Area code 719poly 380 87 427 89 426 168 377 171 Area code 785poly 380 26 290 23 290 0 422 0 425 87 380 88 Area code 308poly 291 24 4 1 291 0 Area code 307poly 42 245 0 243 0 1 66 7 Area code 435poly 38 292 0 293 0 242 42 247 Area code 928poly 119 253 107 262 104 294 327 294 330 268 Area code 575poly 45 247 41 294 104 294 107 262 119 253 Area code 505poly 329 293 425 293 425 271 330 268 Area code 580poly 376 170 426 170 427 270 375 270 Area code 620desc top-rightArea codes 303 and 720 are telephone area codes serving the state of Colorado. They cover Boulder, Longmont, Aurora, Denver, Highlands Ranch and other areas in central Colorado. Area code 303 is overlaid with Area code 720, meaning that the same physical service area is served by both area codes (303 and 720) and that 10-digit dialing is required for all calls made within the service area.

Originally, all of Colorado was served by the 303 area code but as the population grew, an impending phone number shortage forced a split of the state's area codes (now into three calling areas: 303/720, 719 and 970). The area currently served by 303/720 was originally served by only the 303 area code after the Colorado area code splits. With one exception (the Roggen area, which has local calling only with itself, Brighton, and Wiggins [http://www.localcallingguide.com/lca_exch.php?exch=027320] ), the entire 303/720 area is a local calling zone, so long distance is not applied to any calls made from one phone to another within the area.

With the exception mentioned above, all users in the 303/720 area code must dial all ten digits in order to reach a destination phone, even if that phone is next door. Some users in the area have shortened the two area codes to a single digit with a slash for easy writing. So 303-555-1212 is written down as 3/555-1212. Since 303 is the dominant area code, if a number appears without an area code it is assumed to be 303.

ee also

Area Code Box 0 | State = CO | This = Area code 303 / 720
N = 970
S = 719
W = 970
E = 719


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  • Area code 970 — #poly 67 8 381 26 380 108 356 107 352 131 343 130 340 107 326 102 320 104 301 104 301 85 282 85 287 77 263 77 259 84 216 79 204 102 182 125 177 144 191 151 199 177 180 203 168 207 166 219 151 219 149 229 167 226 168 238 186 238 196 227 203 228… …   Wikipedia

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