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, SOUTH PITTSBURG, TN 37380-0161
PO BOX 162, SOUTH PITTSBURG, TN 37380-0162
PO BOX 163, SOUTH PITTSBURG, TN 37380-0163
PO BOX 164, SOUTH PITTSBURG, TN 37380-0164
PO BOX 165, SOUTH PITTSBURG, TN 37380-0165
PO BOX 166, SOUTH PITTSBURG, TN 37380-0166
PO BOX 167, SOUTH PITTSBURG, TN 37380-0167
PO BOX 168, SOUTH PITTSBURG, TN 37380-0168
PO BOX 169, SOUTH PITTSBURG, TN 37380-0169
PO BOX 170, SOUTH PITTSBURG, TN 37380-0170
PO BOX 171, SOUTH PITTSBURG, TN 37380-0171
PO BOX 172, SOUTH PITTSBURG, TN 37380-0172
PO BOX 173, SOUTH PITTSBURG, TN 37380-0173
PO BOX 174, SOUTH PITTSBURG, TN 37380-0174
PO BOX 175, SOUTH PITTSBURG, TN 37380-0175
PO BOX 176, SOUTH PITTSBURG, TN 37380-0176
PO BOX 177, SOUTH PITTSBURG, TN 37380-0177
PO BOX 178, SOUTH PITTSBURG, TN 37380-0178
PO BOX 179, SOUTH PITTSBURG, TN 37380-0179
PO BOX 180, SOUTH PITTSBURG, TN 37380-0180
PO BOX 181, SOUTH PITTSBURG, TN 37380-0181
PO BOX 182, SOUTH PITTSBURG, TN 37380-0182
PO BOX 183, SOUTH PITTSBURG, TN 37380-0183
PO BOX 184, SOUTH PITTSBURG, TN 37380-0184
PO BOX 185, SOUTH PITTSBURG, TN 37380-0185
PO BOX 186, SOUTH PITTSBURG, TN 37380-0186
PO BOX 187, SOUTH PITTSBURG, TN 37380-0187
PO BOX 188, SOUTH PITTSBURG, TN 37380-0188
PO BOX 189, SOUTH PITTSBURG, TN 37380-0189
PO BOX 190, SOUTH PITTSBURG, TN 37380-0190
PO BOX 191, SOUTH PITTSBURG, TN 37380-0191
PO BOX 192, SOUTH PITTSBURG, TN 37380-0192
PO BOX 193, SOUTH PITTSBURG, TN 37380-0193
PO BOX 194, SOUTH PITTSBURG, TN 37380-0194
PO BOX 195, SOUTH PITTSBURG, TN 37380-0195
PO BOX 196, SOUTH PITTSBURG, TN 37380-0196
PO BOX 197, SOUTH PITTSBURG, TN 37380-0197
PO BOX 198, SOUTH PITTSBURG, TN 37380-0198
PO BOX 199, SOUTH PITTSBURG, TN 37380-0199
PO BOX 200, SOUTH PITTSBURG, TN 37380-0200
PO BOX 201, SOUTH PITTSBURG, TN 37380-0201
PO BOX 202, SOUTH PITTSBURG, TN 37380-0202
PO BOX 203, SOUTH PITTSBURG, TN 37380-0203
PO BOX 204, SOUTH PITTSBURG, TN 37380-0204
PO BOX 205, SOUTH PITTSBURG, TN 37380-0205
PO BOX 206, SOUTH PITTSBURG, TN 37380-0206
PO BOX 207, SOUTH PITTSBURG, TN 37380-0207
PO BOX 208, SOUTH PITTSBURG, TN 37380-0208
PO BOX 209, SOUTH PITTSBURG, TN 37380-0209
PO BOX 210, SOUTH PITTSBURG, TN 37380-0210
PO BOX 211, SOUTH PITTSBURG, TN 37380-0211
PO BOX 212, SOUTH PITTSBURG, TN 37380-0212
PO BOX 213, SOUTH PITTSBURG, TN 37380-0213
PO BOX 214, SOUTH PITTSBURG, TN 37380-0214
PO BOX 215, SOUTH PITTSBURG, TN 37380-0215
PO BOX 216, SOUTH PITTSBURG, TN 37380-0216
PO BOX 217, SOUTH PITTSBURG, TN 37380-0217
PO BOX 218, SOUTH PITTSBURG, TN 37380-0218
PO BOX 219, SOUTH PITTSBURG, TN 37380-0219
PO BOX 220, SOUTH PITTSBURG, TN 37380-0220
PO BOX 221, SOUTH PITTSBURG, TN 37380-0221
PO BOX 222, SOUTH PITTSBURG, TN 37380-0222
PO BOX 223, SOUTH PITTSBURG, TN 37380-0223
PO BOX 224, SOUTH PITTSBURG, TN 37380-0224
PO BOX 225, SOUTH PITTSBURG, TN 37380-0225
PO BOX 226, SOUTH PITTSBURG, TN 37380-0226
PO BOX 227, SOUTH PITTSBURG, TN 37380-0227
PO BOX 228, SOUTH PITTSBURG, TN 37380-0228
PO BOX 229, SOUTH PITTSBURG, TN 37380-0229
PO BOX 230, SOUTH PITTSBURG, TN 37380-0230
PO BOX 231, SOUTH PITTSBURG, TN 37380-0231
PO BOX 232, SOUTH PITTSBURG, TN 37380-0232
PO BOX 233, SOUTH PITTSBURG, TN 37380-0233
PO BOX 234, SOUTH PITTSBURG, TN 37380-0234
PO BOX 235, SOUTH PITTSBURG, TN 37380-0235
PO BOX 236, SOUTH PITTSBURG, TN 37380-0236
PO BOX 237, SOUTH PITTSBURG, TN 37380-0237
PO BOX 238, SOUTH PITTSBURG, TN 37380-0238
PO BOX 239, SOUTH PITTSBURG, TN 37380-0239
PO BOX 240, SOUTH PITTSBURG, TN 37380-0240
PO BOX 241, SOUTH PITTSBURG, TN 37380-0241
PO BOX 242, SOUTH PITTSBURG, TN 37380-0242
PO BOX 243, SOUTH PITTSBURG, TN 37380-0243
PO BOX 244, SOUTH PITTSBURG, TN 37380-0244
PO BOX 245, SOUTH PITTSBURG, TN 37380-0245
PO BOX 246, SOUTH PITTSBURG, TN 37380-0246
PO BOX 247, SOUTH PITTSBURG, TN 37380-0247
PO BOX 248, SOUTH PITTSBURG, TN 37380-0248
PO BOX 249, SOUTH PITTSBURG, TN 37380-0249
PO BOX 250, SOUTH PITTSBURG, TN 37380-0250
PO BOX 251, SOUTH PITTSBURG, TN 37380-0251
PO BOX 252, SOUTH PITTSBURG, TN 37380-0252
PO BOX 253, SOUTH PITTSBURG, TN 37380-0253
PO BOX 254, SOUTH PITTSBURG, TN 37380-0254
PO BOX 255, SOUTH PITTSBURG, TN 37380-0255
PO BOX 256, SOUTH PITTSBURG, TN 37380-0256
PO BOX 257, SOUTH PITTSBURG, TN 37380-0257
PO BOX 258, SOUTH PITTSBURG, TN 37380-0258
PO BOX 259, SOUTH PITTSBURG, TN 37380-0259
PO BOX 260, SOUTH PITTSBURG, TN 37380-0260
PO BOX 261, SOUTH PITTSBURG, TN 37380-0261
PO BOX 262, SOUTH PITTSBURG, TN 37380-0262
PO BOX 263, SOUTH PITTSBURG, TN 37380-0263
PO BOX 264, SOUTH PITTSBURG, TN 37380-0264
PO BOX 265, SOUTH PITTSBURG, TN 37380-0265
PO BOX 266, SOUTH PITTSBURG, TN 37380-0266
PO BOX 267, SOUTH PITTSBURG, TN 37380-0267
PO BOX 268, SOUTH PITTSBURG, TN 37380-0268
PO BOX 269, SOUTH PITTSBURG, TN 37380-0269
PO BOX 270, SOUTH PITTSBURG, TN 37380-0270
PO BOX 271, SOUTH PITTSBURG, TN 37380-0271
PO BOX 272, SOUTH PITTSBURG, TN 37380-0272
PO BOX 273, SOUTH PITTSBURG, TN 37380-0273
PO BOX 274, SOUTH PITTSBURG, TN 37380-0274
PO BOX 275, SOUTH PITTSBURG, TN 37380-0275
PO BOX 276, SOUTH PITTSBURG, TN 37380-0276
PO BOX 277, SOUTH PITTSBURG, TN 37380-0277
PO BOX 278, SOUTH PITTSBURG, TN 37380-0278
PO BOX 279, SOUTH PITTSBURG, TN 37380-0279
PO BOX 280, SOUTH PITTSBURG, TN 37380-0280
PO BOX 281, SOUTH PITTSBURG, TN 37380-0281
PO BOX 282, SOUTH PITTSBURG, TN 37380-0282
PO BOX 283, SOUTH PITTSBURG, TN 37380-0283
PO BOX 284, SOUTH PITTSBURG, TN 37380-0284
PO BOX 285, SOUTH PITTSBURG, TN 37380-0285
PO BOX 286, SOUTH PITTSBURG, TN 37380-0286
PO BOX 287, SOUTH PITTSBURG, TN 37380-0287
PO BOX 288, SOUTH PITTSBURG, TN 37380-0288
PO BOX 289, SOUTH PITTSBURG, TN 37380-0289
PO BOX 290, SOUTH PITTSBURG, TN 37380-0290
PO BOX 291, SOUTH PITTSBURG, TN 37380-0291
PO BOX 292, SOUTH PITTSBURG, TN 37380-0292
PO BOX 293, SOUTH PITTSBURG, TN 37380-0293
PO BOX 294, SOUTH PITTSBURG, TN 37380-0294
PO BOX 295, SOUTH PITTSBURG, TN 37380-0295
PO BOX 296, SOUTH PITTSBURG, TN 37380-0296
PO BOX 297, SOUTH PITTSBURG, TN 37380-0297
PO BOX 298, SOUTH PITTSBURG, TN 37380-0298
PO BOX 299, SOUTH PITTSBURG, TN 37380-0299
PO BOX 300, SOUTH PITTSBURG, TN 37380-0300
PO BOX 301, SOUTH PITTSBURG, TN 37380-0301
PO BOX 302, SOUTH PITTSBURG, TN 37380-0302
PO BOX 303, SOUTH PITTSBURG, TN 37380-0303
PO BOX 304, SOUTH PITTSBURG, TN 37380-0304
PO BOX 305, SOUTH PITTSBURG, TN 37380-0305
PO BOX 306, SOUTH PITTSBURG, TN 37380-0306
PO BOX 307, SOUTH PITTSBURG, TN 37380-0307
PO BOX 308, SOUTH PITTSBURG, TN 37380-0308
PO BOX 309, SOUTH PITTSBURG, TN 37380-0309
PO BOX 310, SOUTH PITTSBURG, TN 37380-0310
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