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, EAST SAINT LOUIS, IL 62202-0241
PO BOX 242, EAST SAINT LOUIS, IL 62202-0242
PO BOX 243, EAST SAINT LOUIS, IL 62202-0243
PO BOX 244, EAST SAINT LOUIS, IL 62202-0244
PO BOX 245, EAST SAINT LOUIS, IL 62202-0245
PO BOX 246, EAST SAINT LOUIS, IL 62202-0246
PO BOX 247, EAST SAINT LOUIS, IL 62202-0247
PO BOX 248, EAST SAINT LOUIS, IL 62202-0248
PO BOX 249, EAST SAINT LOUIS, IL 62202-0249
PO BOX 250, EAST SAINT LOUIS, IL 62202-0250
PO BOX 251, EAST SAINT LOUIS, IL 62202-0251
PO BOX 252, EAST SAINT LOUIS, IL 62202-0252
PO BOX 253, EAST SAINT LOUIS, IL 62202-0253
PO BOX 254, EAST SAINT LOUIS, IL 62202-0254
PO BOX 255, EAST SAINT LOUIS, IL 62202-0255
PO BOX 256, EAST SAINT LOUIS, IL 62202-0256
PO BOX 257, EAST SAINT LOUIS, IL 62202-0257
PO BOX 258, EAST SAINT LOUIS, IL 62202-0258
PO BOX 259, EAST SAINT LOUIS, IL 62202-0259
PO BOX 260, EAST SAINT LOUIS, IL 62202-0260
PO BOX 261, EAST SAINT LOUIS, IL 62202-0261
PO BOX 262, EAST SAINT LOUIS, IL 62202-0262
PO BOX 263, EAST SAINT LOUIS, IL 62202-0263
PO BOX 264, EAST SAINT LOUIS, IL 62202-0264
PO BOX 265, EAST SAINT LOUIS, IL 62202-0265
PO BOX 266, EAST SAINT LOUIS, IL 62202-0266
PO BOX 267, EAST SAINT LOUIS, IL 62202-0267
PO BOX 268, EAST SAINT LOUIS, IL 62202-0268
PO BOX 269, EAST SAINT LOUIS, IL 62202-0269
PO BOX 270, EAST SAINT LOUIS, IL 62202-0270
PO BOX 271, EAST SAINT LOUIS, IL 62202-0271
PO BOX 272, EAST SAINT LOUIS, IL 62202-0272
PO BOX 273, EAST SAINT LOUIS, IL 62202-0273
PO BOX 274, EAST SAINT LOUIS, IL 62202-0274
PO BOX 275, EAST SAINT LOUIS, IL 62202-0275
PO BOX 276, EAST SAINT LOUIS, IL 62202-0276
PO BOX 277, EAST SAINT LOUIS, IL 62202-0277
PO BOX 278, EAST SAINT LOUIS, IL 62202-0278
PO BOX 279, EAST SAINT LOUIS, IL 62202-0279
PO BOX 280, EAST SAINT LOUIS, IL 62202-0280
PO BOX 281, EAST SAINT LOUIS, IL 62202-0281
PO BOX 282, EAST SAINT LOUIS, IL 62202-0282
PO BOX 283, EAST SAINT LOUIS, IL 62202-0283
PO BOX 284, EAST SAINT LOUIS, IL 62202-0284
PO BOX 285, EAST SAINT LOUIS, IL 62202-0285
PO BOX 286, EAST SAINT LOUIS, IL 62202-0286
PO BOX 287, EAST SAINT LOUIS, IL 62202-0287
PO BOX 288, EAST SAINT LOUIS, IL 62202-0288
PO BOX 289, EAST SAINT LOUIS, IL 62202-0289
PO BOX 290, EAST SAINT LOUIS, IL 62202-0290
PO BOX 291, EAST SAINT LOUIS, IL 62202-0291
PO BOX 292, EAST SAINT LOUIS, IL 62202-0292
PO BOX 293, EAST SAINT LOUIS, IL 62202-0293
PO BOX 294, EAST SAINT LOUIS, IL 62202-0294
PO BOX 295, EAST SAINT LOUIS, IL 62202-0295
PO BOX 296, EAST SAINT LOUIS, IL 62202-0296
PO BOX 297, EAST SAINT LOUIS, IL 62202-0297
PO BOX 298, EAST SAINT LOUIS, IL 62202-0298
PO BOX 299, EAST SAINT LOUIS, IL 62202-0299
PO BOX 300, EAST SAINT LOUIS, IL 62202-0300
PO BOX 301, EAST SAINT LOUIS, IL 62202-0301
PO BOX 302, EAST SAINT LOUIS, IL 62202-0302
PO BOX 303, EAST SAINT LOUIS, IL 62202-0303
PO BOX 304, EAST SAINT LOUIS, IL 62202-0304
PO BOX 305, EAST SAINT LOUIS, IL 62202-0305
PO BOX 306, EAST SAINT LOUIS, IL 62202-0306
PO BOX 307, EAST SAINT LOUIS, IL 62202-0307
PO BOX 308, EAST SAINT LOUIS, IL 62202-0308
PO BOX 309, EAST SAINT LOUIS, IL 62202-0309
PO BOX 310, EAST SAINT LOUIS, IL 62202-0310
PO BOX 311, EAST SAINT LOUIS, IL 62202-0311
PO BOX 312, EAST SAINT LOUIS, IL 62202-0312
PO BOX 313, EAST SAINT LOUIS, IL 62202-0313
PO BOX 314, EAST SAINT LOUIS, IL 62202-0314
PO BOX 315, EAST SAINT LOUIS, IL 62202-0315
PO BOX 316, EAST SAINT LOUIS, IL 62202-0316
PO BOX 317, EAST SAINT LOUIS, IL 62202-0317
PO BOX 318, EAST SAINT LOUIS, IL 62202-0318
PO BOX 319, EAST SAINT LOUIS, IL 62202-0319
PO BOX 320, EAST SAINT LOUIS, IL 62202-0320
PO BOX 321, EAST SAINT LOUIS, IL 62202-0321
PO BOX 322, EAST SAINT LOUIS, IL 62202-0322
PO BOX 323, EAST SAINT LOUIS, IL 62202-0323
PO BOX 324, EAST SAINT LOUIS, IL 62202-0324
PO BOX 325, EAST SAINT LOUIS, IL 62202-0325
PO BOX 326, EAST SAINT LOUIS, IL 62202-0326
PO BOX 327, EAST SAINT LOUIS, IL 62202-0327
PO BOX 328, EAST SAINT LOUIS, IL 62202-0328
PO BOX 329, EAST SAINT LOUIS, IL 62202-0329
PO BOX 330, EAST SAINT LOUIS, IL 62202-0330
PO BOX 331, EAST SAINT LOUIS, IL 62202-0331
PO BOX 332, EAST SAINT LOUIS, IL 62202-0332
PO BOX 333, EAST SAINT LOUIS, IL 62202-0333
PO BOX 334, EAST SAINT LOUIS, IL 62202-0334
PO BOX 335, EAST SAINT LOUIS, IL 62202-0335
PO BOX 336, EAST SAINT LOUIS, IL 62202-0336
PO BOX 337, EAST SAINT LOUIS, IL 62202-0337
PO BOX 338, EAST SAINT LOUIS, IL 62202-0338
PO BOX 339, EAST SAINT LOUIS, IL 62202-0339
PO BOX 340, EAST SAINT LOUIS, IL 62202-0340
PO BOX 341, EAST SAINT LOUIS, IL 62202-0341
PO BOX 342, EAST SAINT LOUIS, IL 62202-0342
PO BOX 343, EAST SAINT LOUIS, IL 62202-0343
PO BOX 344, EAST SAINT LOUIS, IL 62202-0344
PO BOX 345, EAST SAINT LOUIS, IL 62202-0345
PO BOX 346, EAST SAINT LOUIS, IL 62202-0346
PO BOX 347, EAST SAINT LOUIS, IL 62202-0347
PO BOX 348, EAST SAINT LOUIS, IL 62202-0348
PO BOX 349, EAST SAINT LOUIS, IL 62202-0349
PO BOX 350, EAST SAINT LOUIS, IL 62202-0350
PO BOX 351, EAST SAINT LOUIS, IL 62202-0351
PO BOX 352, EAST SAINT LOUIS, IL 62202-0352
PO BOX 353, EAST SAINT LOUIS, IL 62202-0353
PO BOX 354, EAST SAINT LOUIS, IL 62202-0354
PO BOX 355, EAST SAINT LOUIS, IL 62202-0355
PO BOX 356, EAST SAINT LOUIS, IL 62202-0356
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