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Image:Area code 724.svg|thumb|right|400px|alt=Area code 724|Pennsylvania in blue with Area Code 724 shown in red, to show the overlay with 878. This map is clickable; click on a neighboring area code to go to the page for that code. poly 103 5 79 16 82 17 85 37 136 40 127 21 136 23 140 19 131 15 127 13 142 7 Area code 716 poly 144 7 134 15 133 16 144 22 141 28 130 27 137 38 176 36 169 6 Area code 585 poly 398 99 371 84 372 79 360 77 353 67 347 48 338 48 349 39 357 52 371 45 371 36 363 31 362 25 364 17 378 15 383 4 386 6 387 14 395 24 Area code 845 poly 177 38 170 7 382 5 381 16 363 17 362 31 370 37 370 43 357 52 347 37 338 47 335 36 316 38 Area code 607 poly 353 127 354 107 363 100 360 94 370 82 358 77 350 65 351 55 337 46 334 34 203 37 204 41 210 42 212 46 193 48 194 56 185 56 184 74 166 73 161 99 171 102 178 96 198 117 209 116 208 126 209 140 218 136 225 141 255 139 259 146 249 152 255 156 277 157 301 140 302 128 313 117 322 118 332 123 345 117 Area code 570 poly 398 100 369 82 358 94 362 99 359 103 370 112 375 118 369 124 375 134 384 132 384 134 386 139 396 139 Area code 862/973 poly 397 142 383 139 382 133 347 111 352 119 354 125 345 131 347 143 353 146 355 155 371 161 377 166 381 159 396 165 Area code 908 poly 397 168 380 159 380 160 377 168 370 159 359 160 365 169 376 175 374 181 360 184 368 188 372 200 377 207 377 213 369 218 372 228 367 242 368 258 380 259 395 239 Area code 609 poly 351 196 323 158 335 150 342 153 350 154 357 156 363 158 358 162 367 170 375 175 374 180 360 182 357 186 Area code 215/267 poly 351 197 334 203 325 198 320 199 313 208 289 208 298 192 285 184 295 179 297 170 286 168 278 152 302 137 302 127 313 116 326 120 336 124 346 117 349 117 353 122 346 129 347 142 353 145 356 155 335 152 323 156 Area codes 484/610/835 poly 233 209 164 210 164 203 179 177 189 182 202 165 191 157 183 136 189 134 193 137 208 125 209 139 217 136 225 141 254 140 259 145 253 147 251 151 255 154 266 155 271 159 281 157 285 167 297 171 297 178 285 183 298 193 290 207 Area code 717 poly 338 259 315 257 311 205 323 197 333 203 336 205 329 216 330 220 331 227 326 227 338 244 Area code 302 poly 350 246 330 226 334 204 350 198 357 183 369 188 369 201 378 207 377 213 367 216 370 229 367 254 Area code 856 poly 93 165 77 162 80 153 74 154 70 158 61 155 60 150 68 147 48 133 57 131 61 125 83 123 87 128 98 132 95 139 100 144 Area code 412/878 poly 163 210 98 210 129 128 116 109 100 110 93 114 74 112 84 100 63 75 59 85 49 78 55 64 40 57 40 36 80 15 84 35 204 37 204 42 211 42 213 48 194 48 193 55 185 57 186 71 170 73 168 82 161 99 172 102 179 97 201 117 212 117 207 127 196 136 188 133 182 137 190 155 201 166 192 181 180 178 Area code 814 poly 291 260 245 256 233 209 312 210 317 256 Area code 410/443 poly 215 260 244 256 230 207 94 210 97 249 118 229 123 227 125 231 135 218 135 213 138 213 139 217 142 224 155 224 158 216 165 216 172 212 178 214 182 218 191 217 194 219 194 221 191 222 197 227 195 232 199 234 199 239 Area code 240/301 #poly 36 210 39 56 57 65 48 79 59 85 64 76 73 78 76 99 83 101 74 112 97 114 100 111 116 112 129 130 101 209 Area code 724/878 poly 8 51 39 35 40 71 29 69 29 77 16 79 19 91 13 89 11 83 6 83 Area code 440 poly 8 222 16 207 24 180 32 167 31 152 28 144 28 139 35 140 40 69 30 72 29 78 17 80 19 89 12 90 11 81 5 83 Area code 234/330 poly 93 259 92 209 35 208 38 139 26 141 29 148 30 167 16 210 7 221 9 257 Area code 304/681 # Area code 878 is an overlay area code for area codes 412 and 724 in Southwestern Pennsylvania centered in Pittsburgh. It came into effect on August 17, 2001. 412 had served southwestern Pennsylvania for 41 years before 724 was created for most of the old 412 territory outside of Pittsburgh in 1998. Bell Atlantic (now part of Verizon), the main telephone provider in the area, wanted to implement 724 as an overlay to spare residents and businesses the burden of changing their numbers. However, overlays were still a new concept at the time, and met with considerable resistance due to the need for ten-digit dialing. Thus, the proposal was changed to a geographic split. Within two years, however, both 412 and 724 were on the verge of exhaustion due to the Pittsburgh area's rapid growth and the proliferation of cell phones and pagers. Overlays had gained more acceptance by then, so 878 was implemented as an overlay. Although ten-digit dialing has been mandatory in southwestern Pennsylvania since 2001, no 878 numbers were assigned for more than a decade due to number-conservation procedures implemented in both Pittsburgh itself and the suburbs. On February 15, 2013, the Pennsylvania Public Utility Commission announced it would start to issue 878 numbers in the 724 territory sometime within the next year, as 724 is nearly exhausted.〔http://www.ydr.com/state/ci_22598425/southwestern-pa-get-new-878-area-code〕 At the moment, numbers from the 878 area code will not be assigned in Pittsburgh itself (the 412 area) until it runs out of numbers as well.〔http://www.wpxi.com/news/news/local/western-pennsylvania-getting-new-area-code-thanks-/nWQJk/〕 The first 878 numbers were assigned in April 2013, nearly 12 years after the overlay was activated.〔http://www.nanpa.com/reports/CAA_Report_April_2013.xls〕 ==References== 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 code 878」の詳細全文を読む スポンサード リンク
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