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, CAVALIER, ND 58220-0121
PO BOX 122, CAVALIER, ND 58220-0122
PO BOX 123, CAVALIER, ND 58220-0123
PO BOX 124, CAVALIER, ND 58220-0124
PO BOX 125, CAVALIER, ND 58220-0125
PO BOX 126, CAVALIER, ND 58220-0126
PO BOX 127, CAVALIER, ND 58220-0127
PO BOX 128, CAVALIER, ND 58220-0128
PO BOX 129, CAVALIER, ND 58220-0129
PO BOX 130, CAVALIER, ND 58220-0130
PO BOX 131, CAVALIER, ND 58220-0131
PO BOX 132, CAVALIER, ND 58220-0132
PO BOX 133, CAVALIER, ND 58220-0133
PO BOX 134, CAVALIER, ND 58220-0134
PO BOX 135, CAVALIER, ND 58220-0135
PO BOX 136, CAVALIER, ND 58220-0136
PO BOX 137, CAVALIER, ND 58220-0137
PO BOX 138, CAVALIER, ND 58220-0138
PO BOX 139, CAVALIER, ND 58220-0139
PO BOX 140, CAVALIER, ND 58220-0140
PO BOX 141, CAVALIER, ND 58220-0141
PO BOX 142, CAVALIER, ND 58220-0142
PO BOX 143, CAVALIER, ND 58220-0143
PO BOX 144, CAVALIER, ND 58220-0144
PO BOX 145, CAVALIER, ND 58220-0145
PO BOX 146, CAVALIER, ND 58220-0146
PO BOX 147, CAVALIER, ND 58220-0147
PO BOX 148, CAVALIER, ND 58220-0148
PO BOX 149, CAVALIER, ND 58220-0149
PO BOX 150, CAVALIER, ND 58220-0150
PO BOX 151, CAVALIER, ND 58220-0151
PO BOX 152, CAVALIER, ND 58220-0152
PO BOX 153, CAVALIER, ND 58220-0153
PO BOX 154, CAVALIER, ND 58220-0154
PO BOX 155, CAVALIER, ND 58220-0155
PO BOX 156, CAVALIER, ND 58220-0156
PO BOX 157, CAVALIER, ND 58220-0157
PO BOX 158, CAVALIER, ND 58220-0158
PO BOX 159, CAVALIER, ND 58220-0159
PO BOX 160, CAVALIER, ND 58220-0160
PO BOX 161, CAVALIER, ND 58220-0161
PO BOX 162, CAVALIER, ND 58220-0162
PO BOX 163, CAVALIER, ND 58220-0163
PO BOX 164, CAVALIER, ND 58220-0164
PO BOX 165, CAVALIER, ND 58220-0165
PO BOX 166, CAVALIER, ND 58220-0166
PO BOX 167, CAVALIER, ND 58220-0167
PO BOX 168, CAVALIER, ND 58220-0168
PO BOX 169, CAVALIER, ND 58220-0169
PO BOX 170, CAVALIER, ND 58220-0170
PO BOX 171, CAVALIER, ND 58220-0171
PO BOX 172, CAVALIER, ND 58220-0172
PO BOX 173, CAVALIER, ND 58220-0173
PO BOX 174, CAVALIER, ND 58220-0174
PO BOX 175, CAVALIER, ND 58220-0175
PO BOX 176, CAVALIER, ND 58220-0176
PO BOX 177, CAVALIER, ND 58220-0177
PO BOX 178, CAVALIER, ND 58220-0178
PO BOX 179, CAVALIER, ND 58220-0179
PO BOX 180, CAVALIER, ND 58220-0180
PO BOX 181, CAVALIER, ND 58220-0181
PO BOX 182, CAVALIER, ND 58220-0182
PO BOX 183, CAVALIER, ND 58220-0183
PO BOX 184, CAVALIER, ND 58220-0184
PO BOX 185, CAVALIER, ND 58220-0185
PO BOX 186, CAVALIER, ND 58220-0186
PO BOX 187, CAVALIER, ND 58220-0187
PO BOX 188, CAVALIER, ND 58220-0188
PO BOX 189, CAVALIER, ND 58220-0189
PO BOX 190, CAVALIER, ND 58220-0190
PO BOX 191, CAVALIER, ND 58220-0191
PO BOX 192, CAVALIER, ND 58220-0192
PO BOX 193, CAVALIER, ND 58220-0193
PO BOX 194, CAVALIER, ND 58220-0194
PO BOX 195, CAVALIER, ND 58220-0195
PO BOX 196, CAVALIER, ND 58220-0196
PO BOX 197, CAVALIER, ND 58220-0197
PO BOX 198, CAVALIER, ND 58220-0198
PO BOX 199, CAVALIER, ND 58220-0199
PO BOX 200, CAVALIER, ND 58220-0200
PO BOX 201, CAVALIER, ND 58220-0201
PO BOX 202, CAVALIER, ND 58220-0202
PO BOX 203, CAVALIER, ND 58220-0203
PO BOX 204, CAVALIER, ND 58220-0204
PO BOX 205, CAVALIER, ND 58220-0205
PO BOX 206, CAVALIER, ND 58220-0206
PO BOX 207, CAVALIER, ND 58220-0207
PO BOX 208, CAVALIER, ND 58220-0208
PO BOX 209, CAVALIER, ND 58220-0209
PO BOX 210, CAVALIER, ND 58220-0210
PO BOX 211, CAVALIER, ND 58220-0211
PO BOX 212, CAVALIER, ND 58220-0212
PO BOX 213, CAVALIER, ND 58220-0213
PO BOX 214, CAVALIER, ND 58220-0214
PO BOX 215, CAVALIER, ND 58220-0215
PO BOX 216, CAVALIER, ND 58220-0216
PO BOX 217, CAVALIER, ND 58220-0217
PO BOX 218, CAVALIER, ND 58220-0218
PO BOX 219, CAVALIER, ND 58220-0219
PO BOX 220, CAVALIER, ND 58220-0220
PO BOX 221, CAVALIER, ND 58220-0221
PO BOX 222, CAVALIER, ND 58220-0222
PO BOX 223, CAVALIER, ND 58220-0223
PO BOX 224, CAVALIER, ND 58220-0224
PO BOX 225, CAVALIER, ND 58220-0225
PO BOX 226, CAVALIER, ND 58220-0226
PO BOX 227, CAVALIER, ND 58220-0227
PO BOX 228, CAVALIER, ND 58220-0228
PO BOX 229, CAVALIER, ND 58220-0229
PO BOX 230, CAVALIER, ND 58220-0230
PO BOX 231, CAVALIER, ND 58220-0231
PO BOX 232, CAVALIER, ND 58220-0232
PO BOX 233, CAVALIER, ND 58220-0233
PO BOX 234, CAVALIER, ND 58220-0234
PO BOX 235, CAVALIER, ND 58220-0235
PO BOX 236, CAVALIER, ND 58220-0236
PO BOX 237, CAVALIER, ND 58220-0237
PO BOX 238, CAVALIER, ND 58220-0238
PO BOX 239, CAVALIER, ND 58220-0239
PO BOX 240, CAVALIER, ND 58220-0240
PO BOX 241, CAVALIER, ND 58220-0241
PO BOX 242, CAVALIER, ND 58220-0242
PO BOX 243, CAVALIER, ND 58220-0243
PO BOX 244, CAVALIER, ND 58220-0244
PO BOX 245, CAVALIER, ND 58220-0245
PO BOX 246, CAVALIER, ND 58220-0246
PO BOX 247, CAVALIER, ND 58220-0247
PO BOX 248, CAVALIER, ND 58220-0248
PO BOX 249, CAVALIER, ND 58220-0249
PO BOX 250, CAVALIER, ND 58220-0250
PO BOX 251, CAVALIER, ND 58220-0251
PO BOX 252, CAVALIER, ND 58220-0252
PO BOX 253, CAVALIER, ND 58220-0253
PO BOX 254, CAVALIER, ND 58220-0254
PO BOX 255, CAVALIER, ND 58220-0255
PO BOX 256, CAVALIER, ND 58220-0256
PO BOX 257, CAVALIER, ND 58220-0257
PO BOX 258, CAVALIER, ND 58220-0258
PO BOX 259, CAVALIER, ND 58220-0259
PO BOX 260, CAVALIER, ND 58220-0260
PO BOX 261, CAVALIER, ND 58220-0261
PO BOX 262, CAVALIER, ND 58220-0262
PO BOX 263, CAVALIER, ND 58220-0263
PO BOX 264, CAVALIER, ND 58220-0264
PO BOX 265, CAVALIER, ND 58220-0265
PO BOX 266, CAVALIER, ND 58220-0266
PO BOX 267, CAVALIER, ND 58220-0267
PO BOX 268, CAVALIER, ND 58220-0268
PO BOX 269, CAVALIER, ND 58220-0269
PO BOX 270, CAVALIER, ND 58220-0270
PO BOX 271, CAVALIER, ND 58220-0271
PO BOX 272, CAVALIER, ND 58220-0272
PO BOX 273, CAVALIER, ND 58220-0273
PO BOX 274, CAVALIER, ND 58220-0274
PO BOX 275, CAVALIER, ND 58220-0275
PO BOX 276, CAVALIER, ND 58220-0276
PO BOX 277, CAVALIER, ND 58220-0277
PO BOX 278, CAVALIER, ND 58220-0278
PO BOX 279, CAVALIER, ND 58220-0279
PO BOX 280, CAVALIER, ND 58220-0280
PO BOX 281, CAVALIER, ND 58220-0281
PO BOX 282, CAVALIER, ND 58220-0282
PO BOX 283, CAVALIER, ND 58220-0283
PO BOX 284, CAVALIER, ND 58220-0284
PO BOX 285, CAVALIER, ND 58220-0285
PO BOX 286, CAVALIER, ND 58220-0286
PO BOX 287, CAVALIER, ND 58220-0287
PO BOX 288, CAVALIER, ND 58220-0288
PO BOX 289, CAVALIER, ND 58220-0289
PO BOX 290, CAVALIER, ND 58220-0290
PO BOX 291, CAVALIER, ND 58220-0291
PO BOX 292, CAVALIER, ND 58220-0292
PO BOX 293, CAVALIER, ND 58220-0293
PO BOX 294, CAVALIER, ND 58220-0294
PO BOX 295, CAVALIER, ND 58220-0295
PO BOX 296, CAVALIER, ND 58220-0296
PO BOX 297, CAVALIER, ND 58220-0297
PO BOX 298, CAVALIER, ND 58220-0298
PO BOX 299, CAVALIER, ND 58220-0299
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