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 121, GREENSBORO, FL 32330-0121
PO BOX 122, GREENSBORO, FL 32330-0122
PO BOX 123, GREENSBORO, FL 32330-0123
PO BOX 124, GREENSBORO, FL 32330-0124
PO BOX 125, GREENSBORO, FL 32330-0125
PO BOX 126, GREENSBORO, FL 32330-0126
PO BOX 127, GREENSBORO, FL 32330-0127
PO BOX 128, GREENSBORO, FL 32330-0128
PO BOX 129, GREENSBORO, FL 32330-0129
PO BOX 130, GREENSBORO, FL 32330-0130
PO BOX 131, GREENSBORO, FL 32330-0131
PO BOX 132, GREENSBORO, FL 32330-0132
PO BOX 133, GREENSBORO, FL 32330-0133
PO BOX 134, GREENSBORO, FL 32330-0134
PO BOX 135, GREENSBORO, FL 32330-0135
PO BOX 136, GREENSBORO, FL 32330-0136
PO BOX 137, GREENSBORO, FL 32330-0137
PO BOX 138, GREENSBORO, FL 32330-0138
PO BOX 139, GREENSBORO, FL 32330-0139
PO BOX 140, GREENSBORO, FL 32330-0140
PO BOX 141, GREENSBORO, FL 32330-0141
PO BOX 142, GREENSBORO, FL 32330-0142
PO BOX 143, GREENSBORO, FL 32330-0143
PO BOX 144, GREENSBORO, FL 32330-0144
PO BOX 145, GREENSBORO, FL 32330-0145
PO BOX 146, GREENSBORO, FL 32330-0146
PO BOX 147, GREENSBORO, FL 32330-0147
PO BOX 148, GREENSBORO, FL 32330-0148
PO BOX 149, GREENSBORO, FL 32330-0149
PO BOX 150, GREENSBORO, FL 32330-0150
PO BOX 151, GREENSBORO, FL 32330-0151
PO BOX 152, GREENSBORO, FL 32330-0152
PO BOX 153, GREENSBORO, FL 32330-0153
PO BOX 154, GREENSBORO, FL 32330-0154
PO BOX 155, GREENSBORO, FL 32330-0155
PO BOX 156, GREENSBORO, FL 32330-0156
PO BOX 157, GREENSBORO, FL 32330-0157
PO BOX 158, GREENSBORO, FL 32330-0158
PO BOX 159, GREENSBORO, FL 32330-0159
PO BOX 160, GREENSBORO, FL 32330-0160
PO BOX 161, GREENSBORO, FL 32330-0161
PO BOX 162, GREENSBORO, FL 32330-0162
PO BOX 163, GREENSBORO, FL 32330-0163
PO BOX 164, GREENSBORO, FL 32330-0164
PO BOX 165, GREENSBORO, FL 32330-0165
PO BOX 166, GREENSBORO, FL 32330-0166
PO BOX 167, GREENSBORO, FL 32330-0167
PO BOX 168, GREENSBORO, FL 32330-0168
PO BOX 169, GREENSBORO, FL 32330-0169
PO BOX 170, GREENSBORO, FL 32330-0170
PO BOX 171, GREENSBORO, FL 32330-0171
PO BOX 172, GREENSBORO, FL 32330-0172
PO BOX 173, GREENSBORO, FL 32330-0173
PO BOX 174, GREENSBORO, FL 32330-0174
PO BOX 175, GREENSBORO, FL 32330-0175
PO BOX 176, GREENSBORO, FL 32330-0176
PO BOX 177, GREENSBORO, FL 32330-0177
PO BOX 178, GREENSBORO, FL 32330-0178
PO BOX 179, GREENSBORO, FL 32330-0179
PO BOX 180, GREENSBORO, FL 32330-0180
PO BOX 181, GREENSBORO, FL 32330-0181
PO BOX 182, GREENSBORO, FL 32330-0182
PO BOX 183, GREENSBORO, FL 32330-0183
PO BOX 184, GREENSBORO, FL 32330-0184
PO BOX 185, GREENSBORO, FL 32330-0185
PO BOX 186, GREENSBORO, FL 32330-0186
PO BOX 187, GREENSBORO, FL 32330-0187
PO BOX 188, GREENSBORO, FL 32330-0188
PO BOX 189, GREENSBORO, FL 32330-0189
PO BOX 190, GREENSBORO, FL 32330-0190
PO BOX 191, GREENSBORO, FL 32330-0191
PO BOX 192, GREENSBORO, FL 32330-0192
PO BOX 193, GREENSBORO, FL 32330-0193
PO BOX 194, GREENSBORO, FL 32330-0194
PO BOX 195, GREENSBORO, FL 32330-0195
PO BOX 196, GREENSBORO, FL 32330-0196
PO BOX 197, GREENSBORO, FL 32330-0197
PO BOX 198, GREENSBORO, FL 32330-0198
PO BOX 199, GREENSBORO, FL 32330-0199
PO BOX 200, GREENSBORO, FL 32330-0200
PO BOX 201, GREENSBORO, FL 32330-0201
PO BOX 202, GREENSBORO, FL 32330-0202
PO BOX 203, GREENSBORO, FL 32330-0203
PO BOX 204, GREENSBORO, FL 32330-0204
PO BOX 205, GREENSBORO, FL 32330-0205
PO BOX 206, GREENSBORO, FL 32330-0206
PO BOX 207, GREENSBORO, FL 32330-0207
PO BOX 208, GREENSBORO, FL 32330-0208
PO BOX 209, GREENSBORO, FL 32330-0209
PO BOX 210, GREENSBORO, FL 32330-0210
PO BOX 211, GREENSBORO, FL 32330-0211
PO BOX 212, GREENSBORO, FL 32330-0212
PO BOX 213, GREENSBORO, FL 32330-0213
PO BOX 214, GREENSBORO, FL 32330-0214
PO BOX 215, GREENSBORO, FL 32330-0215
PO BOX 216, GREENSBORO, FL 32330-0216
PO BOX 217, GREENSBORO, FL 32330-0217
PO BOX 218, GREENSBORO, FL 32330-0218
PO BOX 219, GREENSBORO, FL 32330-0219
PO BOX 220, GREENSBORO, FL 32330-0220
PO BOX 221, GREENSBORO, FL 32330-0221
PO BOX 222, GREENSBORO, FL 32330-0222
PO BOX 223, GREENSBORO, FL 32330-0223
PO BOX 224, GREENSBORO, FL 32330-0224
PO BOX 225, GREENSBORO, FL 32330-0225
PO BOX 226, GREENSBORO, FL 32330-0226
PO BOX 227, GREENSBORO, FL 32330-0227
PO BOX 228, GREENSBORO, FL 32330-0228
PO BOX 229, GREENSBORO, FL 32330-0229
PO BOX 230, GREENSBORO, FL 32330-0230
PO BOX 231, GREENSBORO, FL 32330-0231
PO BOX 232, GREENSBORO, FL 32330-0232
PO BOX 233, GREENSBORO, FL 32330-0233
PO BOX 234, GREENSBORO, FL 32330-0234
PO BOX 235, GREENSBORO, FL 32330-0235
PO BOX 236, GREENSBORO, FL 32330-0236
PO BOX 237, GREENSBORO, FL 32330-0237
PO BOX 238, GREENSBORO, FL 32330-0238
PO BOX 239, GREENSBORO, FL 32330-0239
PO BOX 240, GREENSBORO, FL 32330-0240
PO BOX 241, GREENSBORO, FL 32330-0241
PO BOX 242, GREENSBORO, FL 32330-0242
PO BOX 243, GREENSBORO, FL 32330-0243
PO BOX 244, GREENSBORO, FL 32330-0244
PO BOX 245, GREENSBORO, FL 32330-0245
PO BOX 246, GREENSBORO, FL 32330-0246
PO BOX 247, GREENSBORO, FL 32330-0247
PO BOX 248, GREENSBORO, FL 32330-0248
PO BOX 249, GREENSBORO, FL 32330-0249
PO BOX 250, GREENSBORO, FL 32330-0250
PO BOX 251, GREENSBORO, FL 32330-0251
PO BOX 252, GREENSBORO, FL 32330-0252
PO BOX 253, GREENSBORO, FL 32330-0253
PO BOX 254, GREENSBORO, FL 32330-0254
PO BOX 255, GREENSBORO, FL 32330-0255
PO BOX 256, GREENSBORO, FL 32330-0256
PO BOX 257, GREENSBORO, FL 32330-0257
PO BOX 258, GREENSBORO, FL 32330-0258
PO BOX 259, GREENSBORO, FL 32330-0259
PO BOX 260, GREENSBORO, FL 32330-0260
PO BOX 261, GREENSBORO, FL 32330-0261
PO BOX 262, GREENSBORO, FL 32330-0262
PO BOX 263, GREENSBORO, FL 32330-0263
PO BOX 264, GREENSBORO, FL 32330-0264
PO BOX 265, GREENSBORO, FL 32330-0265
PO BOX 266, GREENSBORO, FL 32330-0266
PO BOX 267, GREENSBORO, FL 32330-0267
PO BOX 268, GREENSBORO, FL 32330-0268
PO BOX 269, GREENSBORO, FL 32330-0269
PO BOX 270, GREENSBORO, FL 32330-0270
PO BOX 271, GREENSBORO, FL 32330-0271
PO BOX 272, GREENSBORO, FL 32330-0272
PO BOX 273, GREENSBORO, FL 32330-0273
PO BOX 274, GREENSBORO, FL 32330-0274
PO BOX 275, GREENSBORO, FL 32330-0275
PO BOX 276, GREENSBORO, FL 32330-0276
PO BOX 277, GREENSBORO, FL 32330-0277
PO BOX 278, GREENSBORO, FL 32330-0278
PO BOX 279, GREENSBORO, FL 32330-0279
PO BOX 280, GREENSBORO, FL 32330-0280
PO BOX 281, GREENSBORO, FL 32330-0281
PO BOX 282, GREENSBORO, FL 32330-0282
PO BOX 283, GREENSBORO, FL 32330-0283
PO BOX 284, GREENSBORO, FL 32330-0284
PO BOX 285, GREENSBORO, FL 32330-0285
PO BOX 286, GREENSBORO, FL 32330-0286
PO BOX 287, GREENSBORO, FL 32330-0287
PO BOX 288, GREENSBORO, FL 32330-0288
PO BOX 289, GREENSBORO, FL 32330-0289
PO BOX 290, GREENSBORO, FL 32330-0290
PO BOX 291, GREENSBORO, FL 32330-0291
PO BOX 292, GREENSBORO, FL 32330-0292
PO BOX 293, GREENSBORO, FL 32330-0293
PO BOX 294, GREENSBORO, FL 32330-0294
PO BOX 295, GREENSBORO, FL 32330-0295
PO BOX 296, GREENSBORO, FL 32330-0296
PO BOX 297, GREENSBORO, FL 32330-0297
PO BOX 298, GREENSBORO, FL 32330-0298
PO BOX 299, GREENSBORO, FL 32330-0299
PO BOX 300, GREENSBORO, FL 32330-0300
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