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 126, THETFORD CENTER, VT 05075-0126
PO BOX 127, THETFORD CENTER, VT 05075-0127
PO BOX 128, THETFORD CENTER, VT 05075-0128
PO BOX 129, THETFORD CENTER, VT 05075-0129
PO BOX 130, THETFORD CENTER, VT 05075-0130
PO BOX 131, THETFORD CENTER, VT 05075-0131
PO BOX 132, THETFORD CENTER, VT 05075-0132
PO BOX 133, THETFORD CENTER, VT 05075-0133
PO BOX 134, THETFORD CENTER, VT 05075-0134
PO BOX 135, THETFORD CENTER, VT 05075-0135
PO BOX 136, THETFORD CENTER, VT 05075-0136
PO BOX 137, THETFORD CENTER, VT 05075-0137
PO BOX 138, THETFORD CENTER, VT 05075-0138
PO BOX 139, THETFORD CENTER, VT 05075-0139
PO BOX 140, THETFORD CENTER, VT 05075-0140
PO BOX 141, THETFORD CENTER, VT 05075-0141
PO BOX 142, THETFORD CENTER, VT 05075-0142
PO BOX 143, THETFORD CENTER, VT 05075-0143
PO BOX 144, THETFORD CENTER, VT 05075-0144
PO BOX 145, THETFORD CENTER, VT 05075-0145
PO BOX 146, THETFORD CENTER, VT 05075-0146
PO BOX 147, THETFORD CENTER, VT 05075-0147
PO BOX 148, THETFORD CENTER, VT 05075-0148
PO BOX 149, THETFORD CENTER, VT 05075-0149
PO BOX 150, THETFORD CENTER, VT 05075-0150
PO BOX 151, THETFORD CENTER, VT 05075-0151
PO BOX 152, THETFORD CENTER, VT 05075-0152
PO BOX 153, THETFORD CENTER, VT 05075-0153
PO BOX 154, THETFORD CENTER, VT 05075-0154
PO BOX 155, THETFORD CENTER, VT 05075-0155
PO BOX 156, THETFORD CENTER, VT 05075-0156
PO BOX 157, THETFORD CENTER, VT 05075-0157
PO BOX 158, THETFORD CENTER, VT 05075-0158
PO BOX 159, THETFORD CENTER, VT 05075-0159
PO BOX 160, THETFORD CENTER, VT 05075-0160
PO BOX 161, THETFORD CENTER, VT 05075-0161
PO BOX 162, THETFORD CENTER, VT 05075-0162
PO BOX 163, THETFORD CENTER, VT 05075-0163
PO BOX 164, THETFORD CENTER, VT 05075-0164
PO BOX 165, THETFORD CENTER, VT 05075-0165
PO BOX 166, THETFORD CENTER, VT 05075-0166
PO BOX 167, THETFORD CENTER, VT 05075-0167
PO BOX 168, THETFORD CENTER, VT 05075-0168
PO BOX 169, THETFORD CENTER, VT 05075-0169
PO BOX 170, THETFORD CENTER, VT 05075-0170
PO BOX 171, THETFORD CENTER, VT 05075-0171
PO BOX 172, THETFORD CENTER, VT 05075-0172
PO BOX 173, THETFORD CENTER, VT 05075-0173
PO BOX 174, THETFORD CENTER, VT 05075-0174
PO BOX 175, THETFORD CENTER, VT 05075-0175
PO BOX 176, THETFORD CENTER, VT 05075-0176
PO BOX 177, THETFORD CENTER, VT 05075-0177
PO BOX 178, THETFORD CENTER, VT 05075-0178
PO BOX 179, THETFORD CENTER, VT 05075-0179
PO BOX 180, THETFORD CENTER, VT 05075-0180
PO BOX 181, THETFORD CENTER, VT 05075-0181
PO BOX 182, THETFORD CENTER, VT 05075-0182
PO BOX 183, THETFORD CENTER, VT 05075-0183
PO BOX 184, THETFORD CENTER, VT 05075-0184
PO BOX 185, THETFORD CENTER, VT 05075-0185
PO BOX 186, THETFORD CENTER, VT 05075-0186
PO BOX 187, THETFORD CENTER, VT 05075-0187
PO BOX 188, THETFORD CENTER, VT 05075-0188
PO BOX 189, THETFORD CENTER, VT 05075-0189
PO BOX 190, THETFORD CENTER, VT 05075-0190
PO BOX 191, THETFORD CENTER, VT 05075-0191
PO BOX 192, THETFORD CENTER, VT 05075-0192
PO BOX 193, THETFORD CENTER, VT 05075-0193
PO BOX 194, THETFORD CENTER, VT 05075-0194
PO BOX 195, THETFORD CENTER, VT 05075-0195
PO BOX 196, THETFORD CENTER, VT 05075-0196
PO BOX 197, THETFORD CENTER, VT 05075-0197
PO BOX 198, THETFORD CENTER, VT 05075-0198
PO BOX 199, THETFORD CENTER, VT 05075-0199
PO BOX 200, THETFORD CENTER, VT 05075-0200
PO BOX 201, THETFORD CENTER, VT 05075-0201
PO BOX 202, THETFORD CENTER, VT 05075-0202
PO BOX 203, THETFORD CENTER, VT 05075-0203
PO BOX 204, THETFORD CENTER, VT 05075-0204
PO BOX 205, THETFORD CENTER, VT 05075-0205
PO BOX 206, THETFORD CENTER, VT 05075-0206
PO BOX 207, THETFORD CENTER, VT 05075-0207
PO BOX 208, THETFORD CENTER, VT 05075-0208
PO BOX 209, THETFORD CENTER, VT 05075-0209
PO BOX 210, THETFORD CENTER, VT 05075-0210
PO BOX 211, THETFORD CENTER, VT 05075-0211
PO BOX 212, THETFORD CENTER, VT 05075-0212
PO BOX 213, THETFORD CENTER, VT 05075-0213
PO BOX 214, THETFORD CENTER, VT 05075-0214
PO BOX 215, THETFORD CENTER, VT 05075-0215
PO BOX 216, THETFORD CENTER, VT 05075-0216
PO BOX 217, THETFORD CENTER, VT 05075-0217
PO BOX 218, THETFORD CENTER, VT 05075-0218
PO BOX 219, THETFORD CENTER, VT 05075-0219
PO BOX 220, THETFORD CENTER, VT 05075-0220
PO BOX 221, THETFORD CENTER, VT 05075-0221
PO BOX 222, THETFORD CENTER, VT 05075-0222
PO BOX 223, THETFORD CENTER, VT 05075-0223
PO BOX 224, THETFORD CENTER, VT 05075-0224
PO BOX 225, THETFORD CENTER, VT 05075-0225
PO BOX 226, THETFORD CENTER, VT 05075-0226
PO BOX 227, THETFORD CENTER, VT 05075-0227
PO BOX 228, THETFORD CENTER, VT 05075-0228
PO BOX 229, THETFORD CENTER, VT 05075-0229
PO BOX 230, THETFORD CENTER, VT 05075-0230
PO BOX 231, THETFORD CENTER, VT 05075-0231
PO BOX 232, THETFORD CENTER, VT 05075-0232
PO BOX 233, THETFORD CENTER, VT 05075-0233
PO BOX 234, THETFORD CENTER, VT 05075-0234
PO BOX 235, THETFORD CENTER, VT 05075-0235
PO BOX 236, THETFORD CENTER, VT 05075-0236
PO BOX 237, THETFORD CENTER, VT 05075-0237
PO BOX 238, THETFORD CENTER, VT 05075-0238
PO BOX 239, THETFORD CENTER, VT 05075-0239
PO BOX 240, THETFORD CENTER, VT 05075-0240
PO BOX 241, THETFORD CENTER, VT 05075-0241
PO BOX 242, THETFORD CENTER, VT 05075-0242
PO BOX 243, THETFORD CENTER, VT 05075-0243
PO BOX 244, THETFORD CENTER, VT 05075-0244
PO BOX 245, THETFORD CENTER, VT 05075-0245
PO BOX 246, THETFORD CENTER, VT 05075-0246
PO BOX 247, THETFORD CENTER, VT 05075-0247
PO BOX 248, THETFORD CENTER, VT 05075-0248
PO BOX 249, THETFORD CENTER, VT 05075-0249
PO BOX 250, THETFORD CENTER, VT 05075-0250
PO BOX 251, THETFORD CENTER, VT 05075-0251
PO BOX 252, THETFORD CENTER, VT 05075-0252
PO BOX 253, THETFORD CENTER, VT 05075-0253
PO BOX 254, THETFORD CENTER, VT 05075-0254
PO BOX 255, THETFORD CENTER, VT 05075-0255
PO BOX 256, THETFORD CENTER, VT 05075-0256
PO BOX 257, THETFORD CENTER, VT 05075-0257
PO BOX 258, THETFORD CENTER, VT 05075-0258
PO BOX 259, THETFORD CENTER, VT 05075-0259
PO BOX 260, THETFORD CENTER, VT 05075-0260
PO BOX 261, THETFORD CENTER, VT 05075-0261
PO BOX 262, THETFORD CENTER, VT 05075-0262
PO BOX 263, THETFORD CENTER, VT 05075-0263
PO BOX 264, THETFORD CENTER, VT 05075-0264
PO BOX 265, THETFORD CENTER, VT 05075-0265
PO BOX 266, THETFORD CENTER, VT 05075-0266
PO BOX 267, THETFORD CENTER, VT 05075-0267
PO BOX 268, THETFORD CENTER, VT 05075-0268
PO BOX 269, THETFORD CENTER, VT 05075-0269
PO BOX 270, THETFORD CENTER, VT 05075-0270
PO BOX 271, THETFORD CENTER, VT 05075-0271
PO BOX 272, THETFORD CENTER, VT 05075-0272
PO BOX 273, THETFORD CENTER, VT 05075-0273
PO BOX 274, THETFORD CENTER, VT 05075-0274
PO BOX 275, THETFORD CENTER, VT 05075-0275
PO BOX 276, THETFORD CENTER, VT 05075-0276
PO BOX 277, THETFORD CENTER, VT 05075-0277
PO BOX 278, THETFORD CENTER, VT 05075-0278
PO BOX 279, THETFORD CENTER, VT 05075-0279
PO BOX 280, THETFORD CENTER, VT 05075-0280
PO BOX 281, THETFORD CENTER, VT 05075-0281
PO BOX 282, THETFORD CENTER, VT 05075-0282
PO BOX 283, THETFORD CENTER, VT 05075-0283
PO BOX 284, THETFORD CENTER, VT 05075-0284
PO BOX 285, THETFORD CENTER, VT 05075-0285
PO BOX 286, THETFORD CENTER, VT 05075-0286
PO BOX 287, THETFORD CENTER, VT 05075-0287
PO BOX 288, THETFORD CENTER, VT 05075-0288
PO BOX 289, THETFORD CENTER, VT 05075-0289
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