A PO BOX number can be less than or more than four digit. For post office boxes, the general rule is that each box has its own ZIP+4 code.
The last four digit is often one of the following:
1. Zero plus the last three digits of the box number (eg. PO BOX 1001, Los Angeles CA 90001-0001).
2. The last four digits of the box number (eg. PO BOX 9991, Twin Peaks CA 92391-9991).
3. If the box number is less than four digits, enough zeros prepended to the front of the box number to produce a four-digit number(eg. PO BOX 1, Shreveport LA 71161-0001).
However, there is no uniform rule, the zip code plus four is for reference only, the ZIP+4 code must be looked up individually for each box in the USPS offical website.
PO BOX 241, SOUTHINGTON, CT 06489-0241
PO BOX 242, SOUTHINGTON, CT 06489-0242
PO BOX 243, SOUTHINGTON, CT 06489-0243
PO BOX 244, SOUTHINGTON, CT 06489-0244
PO BOX 245, SOUTHINGTON, CT 06489-0245
PO BOX 246, SOUTHINGTON, CT 06489-0246
PO BOX 247, SOUTHINGTON, CT 06489-0247
PO BOX 248, SOUTHINGTON, CT 06489-0248
PO BOX 249, SOUTHINGTON, CT 06489-0249
PO BOX 250, SOUTHINGTON, CT 06489-0250
PO BOX 251, SOUTHINGTON, CT 06489-0251
PO BOX 252, SOUTHINGTON, CT 06489-0252
PO BOX 253, SOUTHINGTON, CT 06489-0253
PO BOX 254, SOUTHINGTON, CT 06489-0254
PO BOX 255, SOUTHINGTON, CT 06489-0255
PO BOX 256, SOUTHINGTON, CT 06489-0256
PO BOX 257, SOUTHINGTON, CT 06489-0257
PO BOX 258, SOUTHINGTON, CT 06489-0258
PO BOX 259, SOUTHINGTON, CT 06489-0259
PO BOX 260, SOUTHINGTON, CT 06489-0260
PO BOX 261, SOUTHINGTON, CT 06489-0261
PO BOX 262, SOUTHINGTON, CT 06489-0262
PO BOX 263, SOUTHINGTON, CT 06489-0263
PO BOX 264, SOUTHINGTON, CT 06489-0264
PO BOX 265, SOUTHINGTON, CT 06489-0265
PO BOX 266, SOUTHINGTON, CT 06489-0266
PO BOX 267, SOUTHINGTON, CT 06489-0267
PO BOX 268, SOUTHINGTON, CT 06489-0268
PO BOX 269, SOUTHINGTON, CT 06489-0269
PO BOX 270, SOUTHINGTON, CT 06489-0270
PO BOX 271, SOUTHINGTON, CT 06489-0271
PO BOX 272, SOUTHINGTON, CT 06489-0272
PO BOX 273, SOUTHINGTON, CT 06489-0273
PO BOX 274, SOUTHINGTON, CT 06489-0274
PO BOX 275, SOUTHINGTON, CT 06489-0275
PO BOX 276, SOUTHINGTON, CT 06489-0276
PO BOX 277, SOUTHINGTON, CT 06489-0277
PO BOX 278, SOUTHINGTON, CT 06489-0278
PO BOX 279, SOUTHINGTON, CT 06489-0279
PO BOX 280, SOUTHINGTON, CT 06489-0280
PO BOX 281, SOUTHINGTON, CT 06489-0281
PO BOX 282, SOUTHINGTON, CT 06489-0282
PO BOX 283, SOUTHINGTON, CT 06489-0283
PO BOX 284, SOUTHINGTON, CT 06489-0284
PO BOX 285, SOUTHINGTON, CT 06489-0285
PO BOX 286, SOUTHINGTON, CT 06489-0286
PO BOX 287, SOUTHINGTON, CT 06489-0287
PO BOX 288, SOUTHINGTON, CT 06489-0288
PO BOX 289, SOUTHINGTON, CT 06489-0289
PO BOX 290, SOUTHINGTON, CT 06489-0290
PO BOX 291, SOUTHINGTON, CT 06489-0291
PO BOX 292, SOUTHINGTON, CT 06489-0292
PO BOX 293, SOUTHINGTON, CT 06489-0293
PO BOX 294, SOUTHINGTON, CT 06489-0294
PO BOX 295, SOUTHINGTON, CT 06489-0295
PO BOX 296, SOUTHINGTON, CT 06489-0296
PO BOX 297, SOUTHINGTON, CT 06489-0297
PO BOX 298, SOUTHINGTON, CT 06489-0298
PO BOX 299, SOUTHINGTON, CT 06489-0299
PO BOX 300, SOUTHINGTON, CT 06489-0300
PO BOX 301, SOUTHINGTON, CT 06489-0301
PO BOX 302, SOUTHINGTON, CT 06489-0302
PO BOX 303, SOUTHINGTON, CT 06489-0303
PO BOX 304, SOUTHINGTON, CT 06489-0304
PO BOX 305, SOUTHINGTON, CT 06489-0305
PO BOX 306, SOUTHINGTON, CT 06489-0306
PO BOX 307, SOUTHINGTON, CT 06489-0307
PO BOX 308, SOUTHINGTON, CT 06489-0308
PO BOX 309, SOUTHINGTON, CT 06489-0309
PO BOX 310, SOUTHINGTON, CT 06489-0310
PO BOX 311, SOUTHINGTON, CT 06489-0311
PO BOX 312, SOUTHINGTON, CT 06489-0312
PO BOX 313, SOUTHINGTON, CT 06489-0313
PO BOX 314, SOUTHINGTON, CT 06489-0314
PO BOX 315, SOUTHINGTON, CT 06489-0315
PO BOX 316, SOUTHINGTON, CT 06489-0316
PO BOX 317, SOUTHINGTON, CT 06489-0317
PO BOX 318, SOUTHINGTON, CT 06489-0318
PO BOX 319, SOUTHINGTON, CT 06489-0319
PO BOX 320, SOUTHINGTON, CT 06489-0320
PO BOX 321, SOUTHINGTON, CT 06489-0321
PO BOX 322, SOUTHINGTON, CT 06489-0322
PO BOX 323, SOUTHINGTON, CT 06489-0323
PO BOX 324, SOUTHINGTON, CT 06489-0324
PO BOX 325, SOUTHINGTON, CT 06489-0325
PO BOX 326, SOUTHINGTON, CT 06489-0326
PO BOX 327, SOUTHINGTON, CT 06489-0327
PO BOX 328, SOUTHINGTON, CT 06489-0328
PO BOX 329, SOUTHINGTON, CT 06489-0329
PO BOX 330, SOUTHINGTON, CT 06489-0330
PO BOX 331, SOUTHINGTON, CT 06489-0331
PO BOX 332, SOUTHINGTON, CT 06489-0332
PO BOX 333, SOUTHINGTON, CT 06489-0333
PO BOX 334, SOUTHINGTON, CT 06489-0334
PO BOX 335, SOUTHINGTON, CT 06489-0335
PO BOX 336, SOUTHINGTON, CT 06489-0336
PO BOX 337, SOUTHINGTON, CT 06489-0337
PO BOX 338, SOUTHINGTON, CT 06489-0338
PO BOX 339, SOUTHINGTON, CT 06489-0339
PO BOX 340, SOUTHINGTON, CT 06489-0340
PO BOX 341, SOUTHINGTON, CT 06489-0341
PO BOX 342, SOUTHINGTON, CT 06489-0342
PO BOX 343, SOUTHINGTON, CT 06489-0343
PO BOX 344, SOUTHINGTON, CT 06489-0344
PO BOX 345, SOUTHINGTON, CT 06489-0345
PO BOX 346, SOUTHINGTON, CT 06489-0346
PO BOX 347, SOUTHINGTON, CT 06489-0347
PO BOX 348, SOUTHINGTON, CT 06489-0348
PO BOX 349, SOUTHINGTON, CT 06489-0349
PO BOX 350, SOUTHINGTON, CT 06489-0350
PO BOX 351, SOUTHINGTON, CT 06489-0351
PO BOX 352, SOUTHINGTON, CT 06489-0352
PO BOX 353, SOUTHINGTON, CT 06489-0353
PO BOX 354, SOUTHINGTON, CT 06489-0354
PO BOX 355, SOUTHINGTON, CT 06489-0355
PO BOX 356, SOUTHINGTON, CT 06489-0356
PO BOX 357, SOUTHINGTON, CT 06489-0357
PO BOX 358, SOUTHINGTON, CT 06489-0358
PO BOX 359, SOUTHINGTON, CT 06489-0359
PO BOX 360, SOUTHINGTON, CT 06489-0360
PO BOX 361, SOUTHINGTON, CT 06489-0361
PO BOX 362, SOUTHINGTON, CT 06489-0362
PO BOX 363, SOUTHINGTON, CT 06489-0363
PO BOX 364, SOUTHINGTON, CT 06489-0364
PO BOX 365, SOUTHINGTON, CT 06489-0365
PO BOX 366, SOUTHINGTON, CT 06489-0366
PO BOX 367, SOUTHINGTON, CT 06489-0367
PO BOX 368, SOUTHINGTON, CT 06489-0368
PO BOX 369, SOUTHINGTON, CT 06489-0369
PO BOX 370, SOUTHINGTON, CT 06489-0370
PO BOX 371, SOUTHINGTON, CT 06489-0371
PO BOX 372, SOUTHINGTON, CT 06489-0372
PO BOX 373, SOUTHINGTON, CT 06489-0373
PO BOX 374, SOUTHINGTON, CT 06489-0374
PO BOX 375, SOUTHINGTON, CT 06489-0375
PO BOX 376, SOUTHINGTON, CT 06489-0376
PO BOX 377, SOUTHINGTON, CT 06489-0377
PO BOX 378, SOUTHINGTON, CT 06489-0378
PO BOX 379, SOUTHINGTON, CT 06489-0379
PO BOX 380, SOUTHINGTON, CT 06489-0380
PO BOX 381, SOUTHINGTON, CT 06489-0381
PO BOX 382, SOUTHINGTON, CT 06489-0382
PO BOX 383, SOUTHINGTON, CT 06489-0383
PO BOX 384, SOUTHINGTON, CT 06489-0384
PO BOX 385, SOUTHINGTON, CT 06489-0385
PO BOX 386, SOUTHINGTON, CT 06489-0386
PO BOX 387, SOUTHINGTON, CT 06489-0387
PO BOX 388, SOUTHINGTON, CT 06489-0388
PO BOX 389, SOUTHINGTON, CT 06489-0389
PO BOX 390, SOUTHINGTON, CT 06489-0390
PO BOX 391, SOUTHINGTON, CT 06489-0391
PO BOX 392, SOUTHINGTON, CT 06489-0392
PO BOX 393, SOUTHINGTON, CT 06489-0393
PO BOX 394, SOUTHINGTON, CT 06489-0394
PO BOX 395, SOUTHINGTON, CT 06489-0395
PO BOX 396, SOUTHINGTON, CT 06489-0396
PO BOX 397, SOUTHINGTON, CT 06489-0397
PO BOX 398, SOUTHINGTON, CT 06489-0398
PO BOX 399, SOUTHINGTON, CT 06489-0399
PO BOX 400, SOUTHINGTON, CT 06489-0400
PO BOX 401, SOUTHINGTON, CT 06489-0401
PO BOX 402, SOUTHINGTON, CT 06489-0402
PO BOX 403, SOUTHINGTON, CT 06489-0403
PO BOX 404, SOUTHINGTON, CT 06489-0404
PO BOX 405, SOUTHINGTON, CT 06489-0405
PO BOX 406, SOUTHINGTON, CT 06489-0406
PO BOX 407, SOUTHINGTON, CT 06489-0407
PO BOX 408, SOUTHINGTON, CT 06489-0408
PO BOX 409, SOUTHINGTON, CT 06489-0409
PO BOX 410, SOUTHINGTON, CT 06489-0410
PO BOX 411, SOUTHINGTON, CT 06489-0411
PO BOX 412, SOUTHINGTON, CT 06489-0412
PO BOX 413, SOUTHINGTON, CT 06489-0413
PO BOX 414, SOUTHINGTON, CT 06489-0414
PO BOX 415, SOUTHINGTON, CT 06489-0415
PO BOX 416, SOUTHINGTON, CT 06489-0416
PO BOX 417, SOUTHINGTON, CT 06489-0417
PO BOX 418, SOUTHINGTON, CT 06489-0418
PO BOX 419, SOUTHINGTON, CT 06489-0419
PO BOX 420, SOUTHINGTON, CT 06489-0420
PO BOX 421, SOUTHINGTON, CT 06489-0421
PO BOX 422, SOUTHINGTON, CT 06489-0422
PO BOX 423, SOUTHINGTON, CT 06489-0423
PO BOX 424, SOUTHINGTON, CT 06489-0424
PO BOX 425, SOUTHINGTON, CT 06489-0425
PO BOX 426, SOUTHINGTON, CT 06489-0426
PO BOX 427, SOUTHINGTON, CT 06489-0427
PO BOX 428, SOUTHINGTON, CT 06489-0428
PO BOX 429, SOUTHINGTON, CT 06489-0429
PO BOX 430, SOUTHINGTON, CT 06489-0430
PO BOX 431, SOUTHINGTON, CT 06489-0431
PO BOX 432, SOUTHINGTON, CT 06489-0432
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