Area code 878

<imagemap> Image:Area code 878.svg|thumb|right|400px|alt=Area code 878|Pennsylvania (blue) with numbering plan area 878 shown in red. poly 79 31 79 14 99 0 135 1 133 6 126 11 131 15 140 16 133 24 130 22 130 30 Area code 716 poly 172 32 171 3 136 2 132 13 138 22 128 25 128 30 Area code 585 poly 336 40 344 33 351 47 365 39 359 25 359 12 374 11 377 1 172 2 170 32 328 32 Area code 607 poly 390 95 390 17 376 4 374 11 357 10 358 23 364 35 350 47 344 33 334 41 341 45 346 57 345 63 354 72 364 76 Area code 845 poly 390 135 377 136 378 126 369 125 363 119 366 109 351 93 368 80 390 94 Area codes 973 and 862 poly 391 158 374 152 368 155 346 146 340 123 344 113 343 102 355 97 361 102 363 106 366 113 362 119 366 124 376 127 378 132 390 137 Area code 908 poly 228 205 241 255 312 255 307 205 Area codes 410 and 443 poly 311 203 312 255 336 255 333 239 321 223 327 197 317 193 Area code 302 poly 91 244 91 206 227 206 237 255 203 255 194 236 179 214 169 208 164 211 151 214 152 221 130 217 122 225 114 225 Area codes 240 and 301 poly 91 255 0 255 0 213 23 162 27 146 21 136 31 134 31 205 92 204 Area codes 304 and 681 poly 0 81 5 79 7 81 15 84 11 76 21 72 24 66 33 67 30 132 2 218 Area codes 330 and 234 poly 1 48 34 30 30 64 0 80 Area code 440 poly 93 203 31 203 35 49 49 57 44 72 56 81 61 70 68 73 73 93 75 94 68 106 89 108 97 104 96 123 84 118 79 113 51 115 49 123 39 126 60 138 55 150 62 153 73 146 70 159 91 159 90 163 66 164 64 176 89 176 Area code 724 rect 66 164 90 176 Area code 878 poly 121 122 110 104 93 103 99 124 92 135 99 137 91 160 89 166 93 167 94 177 89 179 93 205 Area code 724 poly 80 14 36 43 38 52 53 57 47 73 58 79 62 71 70 72 75 94 81 94 72 104 73 106 92 107 96 105 114 104 126 123 96 204 159 203 179 170 191 177 198 158 187 147 182 129 187 128 191 131 205 118 209 110 197 110 171 87 170 95 159 89 165 71 166 66 184 66 181 49 191 46 190 41 210 39 210 37 200 36 202 32 78 31 Area code 814 poly 209 112 193 112 157 92 163 66 181 66 180 51 188 48 188 42 207 41 207 37 199 34 200 30 329 34 335 41 343 52 348 60 345 65 357 76 366 79 367 81 356 97 346 107 348 119 344 122 341 114 332 118 308 111 297 124 298 134 274 151 250 151 245 144 256 140 251 137 224 137 215 132 207 135 202 123 Area codes 272 and 570 poly 273 150 291 131 294 119 307 110 326 114 335 110 344 118 336 126 338 139 346 150 326 144 313 148 343 190 325 199 313 194 305 204 282 202 287 183 274 174 288 170 286 163 275 158 Area codes 610, 484, and 835 poly 360 248 340 245 317 219 327 197 344 191 345 186 357 174 363 183 367 197 371 203 365 211 Area code 856 poly 362 160 369 170 343 190 315 148 350 150 Area codes 215, 267, and 445 poly 390 255 390 158 352 152 371 170 355 176 367 186 363 194 371 202 364 211 359 255 Area codes 609 and 640 poly 284 204 155 203 177 171 187 176 197 158 185 147 176 126 179 124 185 126 200 120 203 130 213 130 222 135 250 133 256 140 245 142 251 150 276 151 282 162 290 165 291 172 281 177 290 186 Area codes 223 and 717 poly 54 116 77 116 82 123 94 126 87 133 93 136 87 159 73 160 75 150 68 149 64 152 55 146 57 144 61 140 43 128 53 123 Area code 412

</imagemap> Area code 878 is an area code in the North American Numbering Plan for Southwestern Pennsylvania, centered in Pittsburgh. It forms an overlay complex with two distinct numbering plan areas, 412 in Pittsburgh and some suburban areas and 724 in surrounding 412 in the southwestern corner of the state. Area code 878 was activated on August 17, 2001.

History

Area code 412 had served southwestern Pennsylvania for 41 years since 1947, before area code 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 relief plan was changed to a geographic area code split. Within two years, however, both 412 and 724 were in jeopardy of exhaustion. Overlays had gained more acceptance by then, so 878 was implemented as an overlay. It was activated on August 17, 2001.

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 was nearly exhausted. The first 878 numbers were assigned in April 2013, nearly 12 years after the overlay was activated.

On September 15, 2015, the first prefix (999) was assigned in the 412 territory.

As of February 2020, Verizon is issuing 878 telephone numbers for 412's original territory.

See also

• List of Pennsylvania area codes

External links

• NANPA area code map of Pennsylvania

Pennsylvania area codes: 215/267/445, 412, 570/272, 610/484/835, 717/223, 724, 814/582, 878

	North: 814
West: 304/681, 330/234, 440/436	412/878 and 724/878	East: 814
	South: 304/681
Ohio area codes: 216, 330/234, 419/567, 440/436, 513/283, 614/380, 740/220, 937/326
West Virginia area codes: 304/681