- Area Code 300 - Alabama, Jasper US
- Area Code 301 - Alberta, Calgary United States
- Area Code 302 - Alberta, Red Deer United States
- Area Code 303 - Alberta, Calgary United States
- Area Code 304 - Alberta, Red Deer United States
- Area Code 305 - Alberta, Barrhead United States
- Area Code 306 - Alberta, Okotoks United States
- Area Code 307 - Alberta, Red Deer United States
- Area Code 308 - Alberta, Lethbridge United States
- Area Code 309 - Alberta, Red Deer United States
- Area Code 310 - Alabama, Tuscaloosa US
- Area Code 311 - New York, New York US
- Area Code 312 - Alberta, Calgary United States
- Area Code 313 - Alberta, Calgary United States
- Area Code 314 - Alberta, Red Deer United States
- Area Code 315 - Alberta, Lethbridge United States
- Area Code 316 - Alberta, Airdrie United States
- Area Code 317 - Alberta, Lethbridge United States
- Area Code 318 - Alberta, Red Deer United States
- Area Code 319 - Alberta, Calgary United States
- Area Code 320 - Alberta, Lethbridge United States
- Area Code 321 - Alberta, Drumheller United States
- Area Code 322 - Alberta, Rocky Mountain House United States
- Area Code 323 - Alberta, Stettler United States
- Area Code 324 - Alberta, Mclennan United States
- Area Code 325 - Alberta, Strathmore United States
- Area Code 326 - Alberta, Cereal United States
- Area Code 327 - Alberta, Lethbridge United States
- Area Code 328 - Alberta, Lethbridge United States
- Area Code 329 - Alberta, Lethbridge United States
- Area Code 330 - Alberta, Lethbridge United States
- Area Code 331 - Alberta, Lethbridge United States
- Area Code 332 - Alberta, Lethbridge United States
- Area Code 333 - Alberta, Calgary United States
- Area Code 334 - Alberta, Drumheller United States
- Area Code 335 - Alberta, Didsbury United States
- Area Code 336 - Alberta, High River United States
- Area Code 337 - Alberta, Carstairs United States
- Area Code 338 - Alberta, Calgary United States
- Area Code 339 - Alberta, Port Perry United States
- Area Code 340 - Alberta, Red Deer United States
- Area Code 341 - Alberta, Red Deer United States
- Area Code 342 - Alberta, Red Deer United States
- Area Code 343 - Alberta, Red Deer United States
- Area Code 344 - Alberta, Coutts United States
- Area Code 345 - Alberta, Coaldale United States
- Area Code 346 - Alberta, Red Deer United States
- Area Code 347 - Alberta, Red Deer United States
- Area Code 348 - Alberta, Red Deer United States
- Area Code 349 - Alberta, Westlock United States
- Area Code 350 - Alberta, Red Deer United States
- Area Code 351 - Alberta, Calgary United States
- Area Code 352 - Alberta, Red Deer United States
- Area Code 353 - Alberta, Bonanza United States
- Area Code 354 - Alberta, Beaver Lodge United States
- Area Code 355 - Alberta, Calgary United States
- Area Code 356 - Alberta, Red Deer United States
- Area Code 357 - Alberta, Red Deer United States
- Area Code 358 - Alberta, Red Deer United States
- Area Code 359 - Alberta, Lethbridge United States
- Area Code 360 - Alberta, Lethbridge United States
- Area Code 361 - Alberta, Strathmore United States
- Area Code 362 - Alberta, Brooks United States
- Area Code 363 - Alberta, Brooks United States
- Area Code 364 - Alberta, Delia United States
- Area Code 365 - Alberta, Andrew United States
- Area Code 366 - Alberta, Calgary United States
- Area Code 367 - Alberta, Willingdon United States
- Area Code 368 - Alberta, Rumsey United States
- Area Code 369 - Alberta, Calgary United States
- Area Code 370 - Alberta, Calgary United States
- Area Code 371 - Alberta, Calgary United States
- Area Code 372 - Alberta, Crowsnest Pass United States
- Area Code 373 - Alberta, Red Deer United States
- Area Code 374 - Alberta, Calgary United States
- Area Code 375 - Alberta, Calgary United States
- Area Code 376 - Alberta, Strome United States
- Area Code 377 - Alberta, Tilley United States
- Area Code 378 - Alberta, Duchess United States
- Area Code 379 - Alberta, Bindloss United States
- Area Code 380 - Alberta, Lethbridge United States
- Area Code 381 - Alberta, Lethbridge United States
- Area Code 382 - Alberta, Lethbridge United States
- Area Code 383 - Alberta, Calgary United States
- Area Code 384 - Alberta, Sedgewick United States
- Area Code 385 - Alberta, Killam United States
- Area Code 386 - Alberta, Calgary United States
- Area Code 387 - Alberta, Calgary United States
- Area Code 388 - Alberta, Lethbridge United States
- Area Code 389 - Alberta, Calgary United States
- Area Code 390 - Alberta, Calgary United States
- Area Code 391 - Alberta, Red Deer United States
- Area Code 392 - Alberta, Red Deer United States
- Area Code 393 - Alberta, Lethbridge United States
- Area Code 394 - Alberta, Lethbridge United States
- Area Code 395 - Alberta, Cayley United States
- Area Code 396 - Alberta, Red Deer United States
- Area Code 397 - Alberta, Calgary United States
- Area Code 398 - Alberta, Calgary United States
- Area Code 399 - Alberta, Calgary United States