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Image:Area_codes_CO.svg|The map to the right is clickable; click on an area code to go to the page for that area code. Map of Colorado area codes in blue (with border states)|right|350px|thumb 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 79 204 102 182 125 177 144 191 151 199 177 180 203 168 207 166 219 151 219 149 229 167 226 168 238 186 238 196 227 203 228 211 241 199 262 42 247 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 720 poly 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 719 poly 380 87 427 89 426 168 377 171 Area code 785 poly 380 26 290 23 290 0 422 0 425 87 380 88 Area code 308 poly 291 24 4 1 291 0 Area code 307 poly 42 245 0 243 0 1 66 7 Area code 435 poly 38 292 0 293 0 242 42 247 Area code 928 poly 119 253 107 262 104 294 327 294 330 268 Area code 575 poly 45 247 41 294 104 294 107 262 119 253 Area code 505 poly 329 293 425 293 425 271 330 268 Area code 580 poly 376 170 426 170 427 270 375 270 Area code 620 desc top-right Area codes 303 and 720 are telephone area codes serving the north-central portion of the state of Colorado. They cover Denver, Lakewood, Littleton, Boulder, Longmont, Aurora, Castle Rock and most of the Front Range. Area code 303 is the main area code, while area code 720 is an overlay, meaning that the same physical service area is served by both area codes (303 and 720) and that ten-digit dialing is required for all calls made within the service area. Area code 303 was one of the original area codes put into service in 1947, and originally covered the entire state of Colorado. Despite Colorado's explosive expansion during the second half of the 20th century (especially in the Denver area), it remained the sole area code in Colorado for over 40 years. By the late 1980s, an impending number shortage made a split necessary. On March 5, 1988, southeastern Colorado, including Colorado Springs and Pueblo, became area code 719. The northeastern and western portions of area code 303, including Fort Collins, Grand Junction, Vail and Aspen, switched to area code 970 on April 2, 1995, leaving area code 303 to cover its current area. With the 1995 split, 303 is the only Colorado area code that does not border another state. The 1995 split was intended as a long-term solution. However, within two years 303 was close to exhaustion once again. The Front Range is home not only to most of Colorado's landlines, but also most of the state's cell phones, fax machines and pagers. To solve this problem, 720 was activated as an overlay on June 1, 1998. With the exception of the Roggen area, which has local calling only with itself, Brighton and Wiggins,〔(【引用サイトリンク】title=Local Calling Guide )〕 the entire 303/720 area is a local calling zone, meaning no long-distance charges are 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 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, or 720-555-1212 is written down as 7/555-1212. ==See also== List of Colorado area codes 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Area codes 303 and 720」の詳細全文を読む スポンサード リンク
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