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 181, GREENSBORO, MD 21639-0181
PO BOX 182, GREENSBORO, MD 21639-0182
PO BOX 183, GREENSBORO, MD 21639-0183
PO BOX 184, GREENSBORO, MD 21639-0184
PO BOX 185, GREENSBORO, MD 21639-0185
PO BOX 186, GREENSBORO, MD 21639-0186
PO BOX 187, GREENSBORO, MD 21639-0187
PO BOX 188, GREENSBORO, MD 21639-0188
PO BOX 189, GREENSBORO, MD 21639-0189
PO BOX 190, GREENSBORO, MD 21639-0190
PO BOX 191, GREENSBORO, MD 21639-0191
PO BOX 192, GREENSBORO, MD 21639-0192
PO BOX 193, GREENSBORO, MD 21639-0193
PO BOX 194, GREENSBORO, MD 21639-0194
PO BOX 195, GREENSBORO, MD 21639-0195
PO BOX 196, GREENSBORO, MD 21639-0196
PO BOX 197, GREENSBORO, MD 21639-0197
PO BOX 198, GREENSBORO, MD 21639-0198
PO BOX 199, GREENSBORO, MD 21639-0199
PO BOX 200, GREENSBORO, MD 21639-0200
PO BOX 201, GREENSBORO, MD 21639-0201
PO BOX 202, GREENSBORO, MD 21639-0202
PO BOX 203, GREENSBORO, MD 21639-0203
PO BOX 204, GREENSBORO, MD 21639-0204
PO BOX 205, GREENSBORO, MD 21639-0205
PO BOX 206, GREENSBORO, MD 21639-0206
PO BOX 207, GREENSBORO, MD 21639-0207
PO BOX 208, GREENSBORO, MD 21639-0208
PO BOX 209, GREENSBORO, MD 21639-0209
PO BOX 210, GREENSBORO, MD 21639-0210
PO BOX 211, GREENSBORO, MD 21639-0211
PO BOX 212, GREENSBORO, MD 21639-0212
PO BOX 213, GREENSBORO, MD 21639-0213
PO BOX 214, GREENSBORO, MD 21639-0214
PO BOX 215, GREENSBORO, MD 21639-0215
PO BOX 216, GREENSBORO, MD 21639-0216
PO BOX 217, GREENSBORO, MD 21639-0217
PO BOX 218, GREENSBORO, MD 21639-0218
PO BOX 219, GREENSBORO, MD 21639-0219
PO BOX 220, GREENSBORO, MD 21639-0220
PO BOX 221, GREENSBORO, MD 21639-0221
PO BOX 222, GREENSBORO, MD 21639-0222
PO BOX 223, GREENSBORO, MD 21639-0223
PO BOX 224, GREENSBORO, MD 21639-0224
PO BOX 225, GREENSBORO, MD 21639-0225
PO BOX 226, GREENSBORO, MD 21639-0226
PO BOX 227, GREENSBORO, MD 21639-0227
PO BOX 228, GREENSBORO, MD 21639-0228
PO BOX 229, GREENSBORO, MD 21639-0229
PO BOX 230, GREENSBORO, MD 21639-0230
PO BOX 231, GREENSBORO, MD 21639-0231
PO BOX 232, GREENSBORO, MD 21639-0232
PO BOX 233, GREENSBORO, MD 21639-0233
PO BOX 234, GREENSBORO, MD 21639-0234
PO BOX 235, GREENSBORO, MD 21639-0235
PO BOX 236, GREENSBORO, MD 21639-0236
PO BOX 237, GREENSBORO, MD 21639-0237
PO BOX 238, GREENSBORO, MD 21639-0238
PO BOX 239, GREENSBORO, MD 21639-0239
PO BOX 240, GREENSBORO, MD 21639-0240
PO BOX 241, GREENSBORO, MD 21639-0241
PO BOX 242, GREENSBORO, MD 21639-0242
PO BOX 243, GREENSBORO, MD 21639-0243
PO BOX 244, GREENSBORO, MD 21639-0244
PO BOX 245, GREENSBORO, MD 21639-0245
PO BOX 246, GREENSBORO, MD 21639-0246
PO BOX 247, GREENSBORO, MD 21639-0247
PO BOX 248, GREENSBORO, MD 21639-0248
PO BOX 249, GREENSBORO, MD 21639-0249
PO BOX 250, GREENSBORO, MD 21639-0250
PO BOX 251, GREENSBORO, MD 21639-0251
PO BOX 252, GREENSBORO, MD 21639-0252
PO BOX 253, GREENSBORO, MD 21639-0253
PO BOX 254, GREENSBORO, MD 21639-0254
PO BOX 255, GREENSBORO, MD 21639-0255
PO BOX 256, GREENSBORO, MD 21639-0256
PO BOX 257, GREENSBORO, MD 21639-0257
PO BOX 258, GREENSBORO, MD 21639-0258
PO BOX 259, GREENSBORO, MD 21639-0259
PO BOX 260, GREENSBORO, MD 21639-0260
PO BOX 261, GREENSBORO, MD 21639-0261
PO BOX 262, GREENSBORO, MD 21639-0262
PO BOX 263, GREENSBORO, MD 21639-0263
PO BOX 264, GREENSBORO, MD 21639-0264
PO BOX 265, GREENSBORO, MD 21639-0265
PO BOX 266, GREENSBORO, MD 21639-0266
PO BOX 267, GREENSBORO, MD 21639-0267
PO BOX 268, GREENSBORO, MD 21639-0268
PO BOX 269, GREENSBORO, MD 21639-0269
PO BOX 270, GREENSBORO, MD 21639-0270
PO BOX 271, GREENSBORO, MD 21639-0271
PO BOX 272, GREENSBORO, MD 21639-0272
PO BOX 273, GREENSBORO, MD 21639-0273
PO BOX 274, GREENSBORO, MD 21639-0274
PO BOX 275, GREENSBORO, MD 21639-0275
PO BOX 276, GREENSBORO, MD 21639-0276
PO BOX 277, GREENSBORO, MD 21639-0277
PO BOX 278, GREENSBORO, MD 21639-0278
PO BOX 279, GREENSBORO, MD 21639-0279
PO BOX 280, GREENSBORO, MD 21639-0280
PO BOX 281, GREENSBORO, MD 21639-0281
PO BOX 282, GREENSBORO, MD 21639-0282
PO BOX 283, GREENSBORO, MD 21639-0283
PO BOX 284, GREENSBORO, MD 21639-0284
PO BOX 285, GREENSBORO, MD 21639-0285
PO BOX 286, GREENSBORO, MD 21639-0286
PO BOX 287, GREENSBORO, MD 21639-0287
PO BOX 288, GREENSBORO, MD 21639-0288
PO BOX 289, GREENSBORO, MD 21639-0289
PO BOX 290, GREENSBORO, MD 21639-0290
PO BOX 291, GREENSBORO, MD 21639-0291
PO BOX 292, GREENSBORO, MD 21639-0292
PO BOX 293, GREENSBORO, MD 21639-0293
PO BOX 294, GREENSBORO, MD 21639-0294
PO BOX 295, GREENSBORO, MD 21639-0295
PO BOX 296, GREENSBORO, MD 21639-0296
PO BOX 297, GREENSBORO, MD 21639-0297
PO BOX 298, GREENSBORO, MD 21639-0298
PO BOX 299, GREENSBORO, MD 21639-0299
PO BOX 300, GREENSBORO, MD 21639-0300
PO BOX 301, GREENSBORO, MD 21639-0301
PO BOX 302, GREENSBORO, MD 21639-0302
PO BOX 303, GREENSBORO, MD 21639-0303
PO BOX 304, GREENSBORO, MD 21639-0304
PO BOX 305, GREENSBORO, MD 21639-0305
PO BOX 306, GREENSBORO, MD 21639-0306
PO BOX 307, GREENSBORO, MD 21639-0307
PO BOX 308, GREENSBORO, MD 21639-0308
PO BOX 309, GREENSBORO, MD 21639-0309
PO BOX 310, GREENSBORO, MD 21639-0310
PO BOX 311, GREENSBORO, MD 21639-0311
PO BOX 312, GREENSBORO, MD 21639-0312
PO BOX 313, GREENSBORO, MD 21639-0313
PO BOX 314, GREENSBORO, MD 21639-0314
PO BOX 315, GREENSBORO, MD 21639-0315
PO BOX 316, GREENSBORO, MD 21639-0316
PO BOX 317, GREENSBORO, MD 21639-0317
PO BOX 318, GREENSBORO, MD 21639-0318
PO BOX 319, GREENSBORO, MD 21639-0319
PO BOX 320, GREENSBORO, MD 21639-0320
PO BOX 321, GREENSBORO, MD 21639-0321
PO BOX 322, GREENSBORO, MD 21639-0322
PO BOX 323, GREENSBORO, MD 21639-0323
PO BOX 324, GREENSBORO, MD 21639-0324
PO BOX 325, GREENSBORO, MD 21639-0325
PO BOX 326, GREENSBORO, MD 21639-0326
PO BOX 327, GREENSBORO, MD 21639-0327
PO BOX 328, GREENSBORO, MD 21639-0328
PO BOX 329, GREENSBORO, MD 21639-0329
PO BOX 330, GREENSBORO, MD 21639-0330
PO BOX 331, GREENSBORO, MD 21639-0331
PO BOX 332, GREENSBORO, MD 21639-0332
PO BOX 333, GREENSBORO, MD 21639-0333
PO BOX 334, GREENSBORO, MD 21639-0334
PO BOX 335, GREENSBORO, MD 21639-0335
PO BOX 336, GREENSBORO, MD 21639-0336
PO BOX 337, GREENSBORO, MD 21639-0337
PO BOX 338, GREENSBORO, MD 21639-0338
PO BOX 339, GREENSBORO, MD 21639-0339
PO BOX 340, GREENSBORO, MD 21639-0340
PO BOX 341, GREENSBORO, MD 21639-0341
PO BOX 342, GREENSBORO, MD 21639-0342
PO BOX 343, GREENSBORO, MD 21639-0343
PO BOX 344, GREENSBORO, MD 21639-0344
PO BOX 345, GREENSBORO, MD 21639-0345
PO BOX 346, GREENSBORO, MD 21639-0346
PO BOX 347, GREENSBORO, MD 21639-0347
PO BOX 348, GREENSBORO, MD 21639-0348
PO BOX 349, GREENSBORO, MD 21639-0349
PO BOX 350, GREENSBORO, MD 21639-0350
PO BOX 351, GREENSBORO, MD 21639-0351
PO BOX 352, GREENSBORO, MD 21639-0352
PO BOX 353, GREENSBORO, MD 21639-0353
PO BOX 354, GREENSBORO, MD 21639-0354
PO BOX 355, GREENSBORO, MD 21639-0355
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