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, FREDERICKSBURG, VA 22404-0241
PO BOX 242, FREDERICKSBURG, VA 22404-0242
PO BOX 243, FREDERICKSBURG, VA 22404-0243
PO BOX 244, FREDERICKSBURG, VA 22404-0244
PO BOX 245, FREDERICKSBURG, VA 22404-0245
PO BOX 246, FREDERICKSBURG, VA 22404-0246
PO BOX 247, FREDERICKSBURG, VA 22404-0247
PO BOX 248, FREDERICKSBURG, VA 22404-0248
PO BOX 249, FREDERICKSBURG, VA 22404-0249
PO BOX 250, FREDERICKSBURG, VA 22404-0250
PO BOX 251, FREDERICKSBURG, VA 22404-0251
PO BOX 252, FREDERICKSBURG, VA 22404-0252
PO BOX 253, FREDERICKSBURG, VA 22404-0253
PO BOX 254, FREDERICKSBURG, VA 22404-0254
PO BOX 255, FREDERICKSBURG, VA 22404-0255
PO BOX 256, FREDERICKSBURG, VA 22404-0256
PO BOX 257, FREDERICKSBURG, VA 22404-0257
PO BOX 258, FREDERICKSBURG, VA 22404-0258
PO BOX 259, FREDERICKSBURG, VA 22404-0259
PO BOX 260, FREDERICKSBURG, VA 22404-0260
PO BOX 261, FREDERICKSBURG, VA 22404-0261
PO BOX 262, FREDERICKSBURG, VA 22404-0262
PO BOX 263, FREDERICKSBURG, VA 22404-0263
PO BOX 264, FREDERICKSBURG, VA 22404-0264
PO BOX 265, FREDERICKSBURG, VA 22404-0265
PO BOX 266, FREDERICKSBURG, VA 22404-0266
PO BOX 267, FREDERICKSBURG, VA 22404-0267
PO BOX 268, FREDERICKSBURG, VA 22404-0268
PO BOX 269, FREDERICKSBURG, VA 22404-0269
PO BOX 270, FREDERICKSBURG, VA 22404-0270
PO BOX 271, FREDERICKSBURG, VA 22404-0271
PO BOX 272, FREDERICKSBURG, VA 22404-0272
PO BOX 273, FREDERICKSBURG, VA 22404-0273
PO BOX 274, FREDERICKSBURG, VA 22404-0274
PO BOX 275, FREDERICKSBURG, VA 22404-0275
PO BOX 276, FREDERICKSBURG, VA 22404-0276
PO BOX 277, FREDERICKSBURG, VA 22404-0277
PO BOX 278, FREDERICKSBURG, VA 22404-0278
PO BOX 279, FREDERICKSBURG, VA 22404-0279
PO BOX 280, FREDERICKSBURG, VA 22404-0280
PO BOX 281, FREDERICKSBURG, VA 22404-0281
PO BOX 282, FREDERICKSBURG, VA 22404-0282
PO BOX 283, FREDERICKSBURG, VA 22404-0283
PO BOX 284, FREDERICKSBURG, VA 22404-0284
PO BOX 285, FREDERICKSBURG, VA 22404-0285
PO BOX 286, FREDERICKSBURG, VA 22404-0286
PO BOX 287, FREDERICKSBURG, VA 22404-0287
PO BOX 288, FREDERICKSBURG, VA 22404-0288
PO BOX 289, FREDERICKSBURG, VA 22404-0289
PO BOX 290, FREDERICKSBURG, VA 22404-0290
PO BOX 291, FREDERICKSBURG, VA 22404-0291
PO BOX 292, FREDERICKSBURG, VA 22404-0292
PO BOX 293, FREDERICKSBURG, VA 22404-0293
PO BOX 294, FREDERICKSBURG, VA 22404-0294
PO BOX 295, FREDERICKSBURG, VA 22404-0295
PO BOX 296, FREDERICKSBURG, VA 22404-0296
PO BOX 297, FREDERICKSBURG, VA 22404-0297
PO BOX 298, FREDERICKSBURG, VA 22404-0298
PO BOX 299, FREDERICKSBURG, VA 22404-0299
PO BOX 300, FREDERICKSBURG, VA 22404-0300
PO BOX 301, FREDERICKSBURG, VA 22404-0301
PO BOX 302, FREDERICKSBURG, VA 22404-0302
PO BOX 303, FREDERICKSBURG, VA 22404-0303
PO BOX 304, FREDERICKSBURG, VA 22404-0304
PO BOX 305, FREDERICKSBURG, VA 22404-0305
PO BOX 306, FREDERICKSBURG, VA 22404-0306
PO BOX 307, FREDERICKSBURG, VA 22404-0307
PO BOX 308, FREDERICKSBURG, VA 22404-0308
PO BOX 309, FREDERICKSBURG, VA 22404-0309
PO BOX 310, FREDERICKSBURG, VA 22404-0310
PO BOX 311, FREDERICKSBURG, VA 22404-0311
PO BOX 312, FREDERICKSBURG, VA 22404-0312
PO BOX 313, FREDERICKSBURG, VA 22404-0313
PO BOX 314, FREDERICKSBURG, VA 22404-0314
PO BOX 315, FREDERICKSBURG, VA 22404-0315
PO BOX 316, FREDERICKSBURG, VA 22404-0316
PO BOX 317, FREDERICKSBURG, VA 22404-0317
PO BOX 318, FREDERICKSBURG, VA 22404-0318
PO BOX 319, FREDERICKSBURG, VA 22404-0319
PO BOX 320, FREDERICKSBURG, VA 22404-0320
PO BOX 321, FREDERICKSBURG, VA 22404-0321
PO BOX 322, FREDERICKSBURG, VA 22404-0322
PO BOX 323, FREDERICKSBURG, VA 22404-0323
PO BOX 324, FREDERICKSBURG, VA 22404-0324
PO BOX 325, FREDERICKSBURG, VA 22404-0325
PO BOX 326, FREDERICKSBURG, VA 22404-0326
PO BOX 327, FREDERICKSBURG, VA 22404-0327
PO BOX 328, FREDERICKSBURG, VA 22404-0328
PO BOX 329, FREDERICKSBURG, VA 22404-0329
PO BOX 330, FREDERICKSBURG, VA 22404-0330
PO BOX 331, FREDERICKSBURG, VA 22404-0331
PO BOX 332, FREDERICKSBURG, VA 22404-0332
PO BOX 333, FREDERICKSBURG, VA 22404-0333
PO BOX 334, FREDERICKSBURG, VA 22404-0334
PO BOX 335, FREDERICKSBURG, VA 22404-0335
PO BOX 336, FREDERICKSBURG, VA 22404-0336
PO BOX 337, FREDERICKSBURG, VA 22404-0337
PO BOX 338, FREDERICKSBURG, VA 22404-0338
PO BOX 339, FREDERICKSBURG, VA 22404-0339
PO BOX 340, FREDERICKSBURG, VA 22404-0340
PO BOX 341, FREDERICKSBURG, VA 22404-0341
PO BOX 342, FREDERICKSBURG, VA 22404-0342
PO BOX 343, FREDERICKSBURG, VA 22404-0343
PO BOX 344, FREDERICKSBURG, VA 22404-0344
PO BOX 345, FREDERICKSBURG, VA 22404-0345
PO BOX 346, FREDERICKSBURG, VA 22404-0346
PO BOX 347, FREDERICKSBURG, VA 22404-0347
PO BOX 348, FREDERICKSBURG, VA 22404-0348
PO BOX 349, FREDERICKSBURG, VA 22404-0349
PO BOX 350, FREDERICKSBURG, VA 22404-0350
PO BOX 351, FREDERICKSBURG, VA 22404-0351
PO BOX 352, FREDERICKSBURG, VA 22404-0352
PO BOX 353, FREDERICKSBURG, VA 22404-0353
PO BOX 354, FREDERICKSBURG, VA 22404-0354
PO BOX 355, FREDERICKSBURG, VA 22404-0355
PO BOX 356, FREDERICKSBURG, VA 22404-0356
PO BOX 357, FREDERICKSBURG, VA 22404-0357
PO BOX 358, FREDERICKSBURG, VA 22404-0358
PO BOX 359, FREDERICKSBURG, VA 22404-0359
PO BOX 360, FREDERICKSBURG, VA 22404-0360
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