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, PORTLAND, CT 06480-0121
PO BOX 122, PORTLAND, CT 06480-0122
PO BOX 123, PORTLAND, CT 06480-0123
PO BOX 124, PORTLAND, CT 06480-0124
PO BOX 125, PORTLAND, CT 06480-0125
PO BOX 126, PORTLAND, CT 06480-0126
PO BOX 127, PORTLAND, CT 06480-0127
PO BOX 128, PORTLAND, CT 06480-0128
PO BOX 129, PORTLAND, CT 06480-0129
PO BOX 130, PORTLAND, CT 06480-0130
PO BOX 131, PORTLAND, CT 06480-0131
PO BOX 132, PORTLAND, CT 06480-0132
PO BOX 133, PORTLAND, CT 06480-0133
PO BOX 134, PORTLAND, CT 06480-0134
PO BOX 135, PORTLAND, CT 06480-0135
PO BOX 136, PORTLAND, CT 06480-0136
PO BOX 137, PORTLAND, CT 06480-0137
PO BOX 138, PORTLAND, CT 06480-0138
PO BOX 139, PORTLAND, CT 06480-0139
PO BOX 140, PORTLAND, CT 06480-0140
PO BOX 141, PORTLAND, CT 06480-0141
PO BOX 142, PORTLAND, CT 06480-0142
PO BOX 143, PORTLAND, CT 06480-0143
PO BOX 144, PORTLAND, CT 06480-0144
PO BOX 145, PORTLAND, CT 06480-0145
PO BOX 146, PORTLAND, CT 06480-0146
PO BOX 147, PORTLAND, CT 06480-0147
PO BOX 148, PORTLAND, CT 06480-0148
PO BOX 149, PORTLAND, CT 06480-0149
PO BOX 150, PORTLAND, CT 06480-0150
PO BOX 151, PORTLAND, CT 06480-0151
PO BOX 152, PORTLAND, CT 06480-0152
PO BOX 153, PORTLAND, CT 06480-0153
PO BOX 154, PORTLAND, CT 06480-0154
PO BOX 155, PORTLAND, CT 06480-0155
PO BOX 156, PORTLAND, CT 06480-0156
PO BOX 157, PORTLAND, CT 06480-0157
PO BOX 158, PORTLAND, CT 06480-0158
PO BOX 159, PORTLAND, CT 06480-0159
PO BOX 160, PORTLAND, CT 06480-0160
PO BOX 161, PORTLAND, CT 06480-0161
PO BOX 162, PORTLAND, CT 06480-0162
PO BOX 163, PORTLAND, CT 06480-0163
PO BOX 164, PORTLAND, CT 06480-0164
PO BOX 165, PORTLAND, CT 06480-0165
PO BOX 166, PORTLAND, CT 06480-0166
PO BOX 167, PORTLAND, CT 06480-0167
PO BOX 168, PORTLAND, CT 06480-0168
PO BOX 169, PORTLAND, CT 06480-0169
PO BOX 170, PORTLAND, CT 06480-0170
PO BOX 171, PORTLAND, CT 06480-0171
PO BOX 172, PORTLAND, CT 06480-0172
PO BOX 173, PORTLAND, CT 06480-0173
PO BOX 174, PORTLAND, CT 06480-0174
PO BOX 175, PORTLAND, CT 06480-0175
PO BOX 176, PORTLAND, CT 06480-0176
PO BOX 177, PORTLAND, CT 06480-0177
PO BOX 178, PORTLAND, CT 06480-0178
PO BOX 179, PORTLAND, CT 06480-0179
PO BOX 180, PORTLAND, CT 06480-0180
PO BOX 181, PORTLAND, CT 06480-0181
PO BOX 182, PORTLAND, CT 06480-0182
PO BOX 183, PORTLAND, CT 06480-0183
PO BOX 184, PORTLAND, CT 06480-0184
PO BOX 185, PORTLAND, CT 06480-0185
PO BOX 186, PORTLAND, CT 06480-0186
PO BOX 187, PORTLAND, CT 06480-0187
PO BOX 188, PORTLAND, CT 06480-0188
PO BOX 189, PORTLAND, CT 06480-0189
PO BOX 190, PORTLAND, CT 06480-0190
PO BOX 191, PORTLAND, CT 06480-0191
PO BOX 192, PORTLAND, CT 06480-0192
PO BOX 193, PORTLAND, CT 06480-0193
PO BOX 194, PORTLAND, CT 06480-0194
PO BOX 195, PORTLAND, CT 06480-0195
PO BOX 196, PORTLAND, CT 06480-0196
PO BOX 197, PORTLAND, CT 06480-0197
PO BOX 198, PORTLAND, CT 06480-0198
PO BOX 199, PORTLAND, CT 06480-0199
PO BOX 200, PORTLAND, CT 06480-0200
PO BOX 201, PORTLAND, CT 06480-0201
PO BOX 202, PORTLAND, CT 06480-0202
PO BOX 203, PORTLAND, CT 06480-0203
PO BOX 204, PORTLAND, CT 06480-0204
PO BOX 205, PORTLAND, CT 06480-0205
PO BOX 206, PORTLAND, CT 06480-0206
PO BOX 207, PORTLAND, CT 06480-0207
PO BOX 208, PORTLAND, CT 06480-0208
PO BOX 209, PORTLAND, CT 06480-0209
PO BOX 210, PORTLAND, CT 06480-0210
PO BOX 211, PORTLAND, CT 06480-0211
PO BOX 212, PORTLAND, CT 06480-0212
PO BOX 213, PORTLAND, CT 06480-0213
PO BOX 214, PORTLAND, CT 06480-0214
PO BOX 215, PORTLAND, CT 06480-0215
PO BOX 216, PORTLAND, CT 06480-0216
PO BOX 217, PORTLAND, CT 06480-0217
PO BOX 218, PORTLAND, CT 06480-0218
PO BOX 219, PORTLAND, CT 06480-0219
PO BOX 220, PORTLAND, CT 06480-0220
PO BOX 221, PORTLAND, CT 06480-0221
PO BOX 222, PORTLAND, CT 06480-0222
PO BOX 223, PORTLAND, CT 06480-0223
PO BOX 224, PORTLAND, CT 06480-0224
PO BOX 225, PORTLAND, CT 06480-0225
PO BOX 226, PORTLAND, CT 06480-0226
PO BOX 227, PORTLAND, CT 06480-0227
PO BOX 228, PORTLAND, CT 06480-0228
PO BOX 229, PORTLAND, CT 06480-0229
PO BOX 230, PORTLAND, CT 06480-0230
PO BOX 231, PORTLAND, CT 06480-0231
PO BOX 232, PORTLAND, CT 06480-0232
PO BOX 233, PORTLAND, CT 06480-0233
PO BOX 234, PORTLAND, CT 06480-0234
PO BOX 235, PORTLAND, CT 06480-0235
PO BOX 236, PORTLAND, CT 06480-0236
PO BOX 237, PORTLAND, CT 06480-0237
PO BOX 238, PORTLAND, CT 06480-0238
PO BOX 239, PORTLAND, CT 06480-0239
PO BOX 240, PORTLAND, CT 06480-0240
PO BOX 241, PORTLAND, CT 06480-0241
PO BOX 242, PORTLAND, CT 06480-0242
PO BOX 243, PORTLAND, CT 06480-0243
PO BOX 244, PORTLAND, CT 06480-0244
PO BOX 245, PORTLAND, CT 06480-0245
PO BOX 246, PORTLAND, CT 06480-0246
PO BOX 247, PORTLAND, CT 06480-0247
PO BOX 248, PORTLAND, CT 06480-0248
PO BOX 249, PORTLAND, CT 06480-0249
PO BOX 250, PORTLAND, CT 06480-0250
PO BOX 251, PORTLAND, CT 06480-0251
PO BOX 252, PORTLAND, CT 06480-0252
PO BOX 253, PORTLAND, CT 06480-0253
PO BOX 254, PORTLAND, CT 06480-0254
PO BOX 255, PORTLAND, CT 06480-0255
PO BOX 256, PORTLAND, CT 06480-0256
PO BOX 257, PORTLAND, CT 06480-0257
PO BOX 258, PORTLAND, CT 06480-0258
PO BOX 259, PORTLAND, CT 06480-0259
PO BOX 260, PORTLAND, CT 06480-0260
PO BOX 261, PORTLAND, CT 06480-0261
PO BOX 262, PORTLAND, CT 06480-0262
PO BOX 263, PORTLAND, CT 06480-0263
PO BOX 264, PORTLAND, CT 06480-0264
PO BOX 265, PORTLAND, CT 06480-0265
PO BOX 266, PORTLAND, CT 06480-0266
PO BOX 267, PORTLAND, CT 06480-0267
PO BOX 268, PORTLAND, CT 06480-0268
PO BOX 269, PORTLAND, CT 06480-0269
PO BOX 270, PORTLAND, CT 06480-0270
PO BOX 271, PORTLAND, CT 06480-0271
PO BOX 272, PORTLAND, CT 06480-0272
PO BOX 273, PORTLAND, CT 06480-0273
PO BOX 274, PORTLAND, CT 06480-0274
PO BOX 275, PORTLAND, CT 06480-0275
PO BOX 276, PORTLAND, CT 06480-0276
PO BOX 277, PORTLAND, CT 06480-0277
PO BOX 278, PORTLAND, CT 06480-0278
PO BOX 279, PORTLAND, CT 06480-0279
PO BOX 280, PORTLAND, CT 06480-0280
PO BOX 281, PORTLAND, CT 06480-0281
PO BOX 282, PORTLAND, CT 06480-0282
PO BOX 283, PORTLAND, CT 06480-0283
PO BOX 284, PORTLAND, CT 06480-0284
PO BOX 285, PORTLAND, CT 06480-0285
PO BOX 286, PORTLAND, CT 06480-0286
PO BOX 287, PORTLAND, CT 06480-0287
PO BOX 288, PORTLAND, CT 06480-0288
PO BOX 289, PORTLAND, CT 06480-0289
PO BOX 290, PORTLAND, CT 06480-0290
PO BOX 291, PORTLAND, CT 06480-0291
PO BOX 292, PORTLAND, CT 06480-0292
PO BOX 293, PORTLAND, CT 06480-0293
PO BOX 294, PORTLAND, CT 06480-0294
PO BOX 295, PORTLAND, CT 06480-0295
PO BOX 296, PORTLAND, CT 06480-0296
PO BOX 297, PORTLAND, CT 06480-0297
PO BOX 298, PORTLAND, CT 06480-0298
PO BOX 299, PORTLAND, CT 06480-0299
PO BOX 300, PORTLAND, CT 06480-0300
PO BOX 301, PORTLAND, CT 06480-0301
PO BOX 302, PORTLAND, CT 06480-0302
PO BOX 303, PORTLAND, CT 06480-0303
PO BOX 304, PORTLAND, CT 06480-0304
PO BOX 305, PORTLAND, CT 06480-0305
PO BOX 306, PORTLAND, CT 06480-0306
PO BOX 307, PORTLAND, CT 06480-0307
PO BOX 308, PORTLAND, CT 06480-0308
PO BOX 309, PORTLAND, CT 06480-0309
PO BOX 310, PORTLAND, CT 06480-0310
PO BOX 311, PORTLAND, CT 06480-0311
PO BOX 312, PORTLAND, CT 06480-0312
PO BOX 313, PORTLAND, CT 06480-0313
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