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 161, HOUSTON, MS 38851-0161
PO BOX 162, HOUSTON, MS 38851-0162
PO BOX 163, HOUSTON, MS 38851-0163
PO BOX 164, HOUSTON, MS 38851-0164
PO BOX 165, HOUSTON, MS 38851-0165
PO BOX 166, HOUSTON, MS 38851-0166
PO BOX 167, HOUSTON, MS 38851-0167
PO BOX 168, HOUSTON, MS 38851-0168
PO BOX 169, HOUSTON, MS 38851-0169
PO BOX 170, HOUSTON, MS 38851-0170
PO BOX 171, HOUSTON, MS 38851-0171
PO BOX 172, HOUSTON, MS 38851-0172
PO BOX 173, HOUSTON, MS 38851-0173
PO BOX 174, HOUSTON, MS 38851-0174
PO BOX 175, HOUSTON, MS 38851-0175
PO BOX 176, HOUSTON, MS 38851-0176
PO BOX 177, HOUSTON, MS 38851-0177
PO BOX 178, HOUSTON, MS 38851-0178
PO BOX 179, HOUSTON, MS 38851-0179
PO BOX 180, HOUSTON, MS 38851-0180
PO BOX 181, HOUSTON, MS 38851-0181
PO BOX 182, HOUSTON, MS 38851-0182
PO BOX 183, HOUSTON, MS 38851-0183
PO BOX 184, HOUSTON, MS 38851-0184
PO BOX 185, HOUSTON, MS 38851-0185
PO BOX 186, HOUSTON, MS 38851-0186
PO BOX 187, HOUSTON, MS 38851-0187
PO BOX 188, HOUSTON, MS 38851-0188
PO BOX 189, HOUSTON, MS 38851-0189
PO BOX 190, HOUSTON, MS 38851-0190
PO BOX 191, HOUSTON, MS 38851-0191
PO BOX 192, HOUSTON, MS 38851-0192
PO BOX 193, HOUSTON, MS 38851-0193
PO BOX 194, HOUSTON, MS 38851-0194
PO BOX 195, HOUSTON, MS 38851-0195
PO BOX 196, HOUSTON, MS 38851-0196
PO BOX 197, HOUSTON, MS 38851-0197
PO BOX 198, HOUSTON, MS 38851-0198
PO BOX 199, HOUSTON, MS 38851-0199
PO BOX 200, HOUSTON, MS 38851-0200
PO BOX 201, HOUSTON, MS 38851-0201
PO BOX 202, HOUSTON, MS 38851-0202
PO BOX 203, HOUSTON, MS 38851-0203
PO BOX 204, HOUSTON, MS 38851-0204
PO BOX 205, HOUSTON, MS 38851-0205
PO BOX 206, HOUSTON, MS 38851-0206
PO BOX 207, HOUSTON, MS 38851-0207
PO BOX 208, HOUSTON, MS 38851-0208
PO BOX 209, HOUSTON, MS 38851-0209
PO BOX 210, HOUSTON, MS 38851-0210
PO BOX 211, HOUSTON, MS 38851-0211
PO BOX 212, HOUSTON, MS 38851-0212
PO BOX 213, HOUSTON, MS 38851-0213
PO BOX 214, HOUSTON, MS 38851-0214
PO BOX 215, HOUSTON, MS 38851-0215
PO BOX 216, HOUSTON, MS 38851-0216
PO BOX 217, HOUSTON, MS 38851-0217
PO BOX 218, HOUSTON, MS 38851-0218
PO BOX 219, HOUSTON, MS 38851-0219
PO BOX 220, HOUSTON, MS 38851-0220
PO BOX 221, HOUSTON, MS 38851-0221
PO BOX 222, HOUSTON, MS 38851-0222
PO BOX 223, HOUSTON, MS 38851-0223
PO BOX 224, HOUSTON, MS 38851-0224
PO BOX 225, HOUSTON, MS 38851-0225
PO BOX 226, HOUSTON, MS 38851-0226
PO BOX 227, HOUSTON, MS 38851-0227
PO BOX 228, HOUSTON, MS 38851-0228
PO BOX 229, HOUSTON, MS 38851-0229
PO BOX 230, HOUSTON, MS 38851-0230
PO BOX 231, HOUSTON, MS 38851-0231
PO BOX 232, HOUSTON, MS 38851-0232
PO BOX 233, HOUSTON, MS 38851-0233
PO BOX 234, HOUSTON, MS 38851-0234
PO BOX 235, HOUSTON, MS 38851-0235
PO BOX 236, HOUSTON, MS 38851-0236
PO BOX 237, HOUSTON, MS 38851-0237
PO BOX 238, HOUSTON, MS 38851-0238
PO BOX 239, HOUSTON, MS 38851-0239
PO BOX 240, HOUSTON, MS 38851-0240
PO BOX 241, HOUSTON, MS 38851-0241
PO BOX 242, HOUSTON, MS 38851-0242
PO BOX 243, HOUSTON, MS 38851-0243
PO BOX 244, HOUSTON, MS 38851-0244
PO BOX 245, HOUSTON, MS 38851-0245
PO BOX 246, HOUSTON, MS 38851-0246
PO BOX 247, HOUSTON, MS 38851-0247
PO BOX 248, HOUSTON, MS 38851-0248
PO BOX 249, HOUSTON, MS 38851-0249
PO BOX 250, HOUSTON, MS 38851-0250
PO BOX 251, HOUSTON, MS 38851-0251
PO BOX 252, HOUSTON, MS 38851-0252
PO BOX 253, HOUSTON, MS 38851-0253
PO BOX 254, HOUSTON, MS 38851-0254
PO BOX 255, HOUSTON, MS 38851-0255
PO BOX 256, HOUSTON, MS 38851-0256
PO BOX 257, HOUSTON, MS 38851-0257
PO BOX 258, HOUSTON, MS 38851-0258
PO BOX 259, HOUSTON, MS 38851-0259
PO BOX 260, HOUSTON, MS 38851-0260
PO BOX 261, HOUSTON, MS 38851-0261
PO BOX 262, HOUSTON, MS 38851-0262
PO BOX 263, HOUSTON, MS 38851-0263
PO BOX 264, HOUSTON, MS 38851-0264
PO BOX 265, HOUSTON, MS 38851-0265
PO BOX 266, HOUSTON, MS 38851-0266
PO BOX 267, HOUSTON, MS 38851-0267
PO BOX 268, HOUSTON, MS 38851-0268
PO BOX 269, HOUSTON, MS 38851-0269
PO BOX 270, HOUSTON, MS 38851-0270
PO BOX 271, HOUSTON, MS 38851-0271
PO BOX 272, HOUSTON, MS 38851-0272
PO BOX 273, HOUSTON, MS 38851-0273
PO BOX 274, HOUSTON, MS 38851-0274
PO BOX 275, HOUSTON, MS 38851-0275
PO BOX 276, HOUSTON, MS 38851-0276
PO BOX 277, HOUSTON, MS 38851-0277
PO BOX 278, HOUSTON, MS 38851-0278
PO BOX 279, HOUSTON, MS 38851-0279
PO BOX 280, HOUSTON, MS 38851-0280
PO BOX 281, HOUSTON, MS 38851-0281
PO BOX 282, HOUSTON, MS 38851-0282
PO BOX 283, HOUSTON, MS 38851-0283
PO BOX 284, HOUSTON, MS 38851-0284
PO BOX 285, HOUSTON, MS 38851-0285
PO BOX 286, HOUSTON, MS 38851-0286
PO BOX 287, HOUSTON, MS 38851-0287
PO BOX 288, HOUSTON, MS 38851-0288
PO BOX 289, HOUSTON, MS 38851-0289
PO BOX 290, HOUSTON, MS 38851-0290
PO BOX 291, HOUSTON, MS 38851-0291
PO BOX 292, HOUSTON, MS 38851-0292
PO BOX 293, HOUSTON, MS 38851-0293
PO BOX 294, HOUSTON, MS 38851-0294
PO BOX 295, HOUSTON, MS 38851-0295
PO BOX 296, HOUSTON, MS 38851-0296
PO BOX 297, HOUSTON, MS 38851-0297
PO BOX 298, HOUSTON, MS 38851-0298
PO BOX 299, HOUSTON, MS 38851-0299
PO BOX 300, HOUSTON, MS 38851-0300
PO BOX 301, HOUSTON, MS 38851-0301
PO BOX 302, HOUSTON, MS 38851-0302
PO BOX 303, HOUSTON, MS 38851-0303
PO BOX 304, HOUSTON, MS 38851-0304
PO BOX 305, HOUSTON, MS 38851-0305
PO BOX 306, HOUSTON, MS 38851-0306
PO BOX 307, HOUSTON, MS 38851-0307
PO BOX 308, HOUSTON, MS 38851-0308
PO BOX 309, HOUSTON, MS 38851-0309
PO BOX 310, HOUSTON, MS 38851-0310
PO BOX 311, HOUSTON, MS 38851-0311
PO BOX 312, HOUSTON, MS 38851-0312
PO BOX 313, HOUSTON, MS 38851-0313
PO BOX 314, HOUSTON, MS 38851-0314
PO BOX 315, HOUSTON, MS 38851-0315
PO BOX 316, HOUSTON, MS 38851-0316
PO BOX 317, HOUSTON, MS 38851-0317
PO BOX 318, HOUSTON, MS 38851-0318
PO BOX 319, HOUSTON, MS 38851-0319
PO BOX 320, HOUSTON, MS 38851-0320
PO BOX 321, HOUSTON, MS 38851-0321
PO BOX 322, HOUSTON, MS 38851-0322
PO BOX 323, HOUSTON, MS 38851-0323
PO BOX 324, HOUSTON, MS 38851-0324
PO BOX 325, HOUSTON, MS 38851-0325
PO BOX 326, HOUSTON, MS 38851-0326
PO BOX 327, HOUSTON, MS 38851-0327
PO BOX 328, HOUSTON, MS 38851-0328
PO BOX 329, HOUSTON, MS 38851-0329
PO BOX 330, HOUSTON, MS 38851-0330
PO BOX 331, HOUSTON, MS 38851-0331
PO BOX 332, HOUSTON, MS 38851-0332
PO BOX 333, HOUSTON, MS 38851-0333
PO BOX 334, HOUSTON, MS 38851-0334
PO BOX 335, HOUSTON, MS 38851-0335
PO BOX 336, HOUSTON, MS 38851-0336
PO BOX 337, HOUSTON, MS 38851-0337
PO BOX 338, HOUSTON, MS 38851-0338
PO BOX 339, HOUSTON, MS 38851-0339
PO BOX 340, HOUSTON, MS 38851-0340
PO BOX 341, HOUSTON, MS 38851-0341
PO BOX 342, HOUSTON, MS 38851-0342
PO BOX 343, HOUSTON, MS 38851-0343
PO BOX 344, HOUSTON, MS 38851-0344
PO BOX 345, HOUSTON, MS 38851-0345
PO BOX 346, HOUSTON, MS 38851-0346
PO BOX 347, HOUSTON, MS 38851-0347
PO BOX 348, HOUSTON, MS 38851-0348
PO BOX 349, HOUSTON, MS 38851-0349
PO BOX 350, HOUSTON, MS 38851-0350
PO BOX 351, HOUSTON, MS 38851-0351
PO BOX 352, HOUSTON, MS 38851-0352
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