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, ALTOONA, PA 16603-0121
PO BOX 122, ALTOONA, PA 16603-0122
PO BOX 123, ALTOONA, PA 16603-0123
PO BOX 124, ALTOONA, PA 16603-0124
PO BOX 125, ALTOONA, PA 16603-0125
PO BOX 126, ALTOONA, PA 16603-0126
PO BOX 127, ALTOONA, PA 16603-0127
PO BOX 128, ALTOONA, PA 16603-0128
PO BOX 129, ALTOONA, PA 16603-0129
PO BOX 130, ALTOONA, PA 16603-0130
PO BOX 131, ALTOONA, PA 16603-0131
PO BOX 132, ALTOONA, PA 16603-0132
PO BOX 133, ALTOONA, PA 16603-0133
PO BOX 134, ALTOONA, PA 16603-0134
PO BOX 135, ALTOONA, PA 16603-0135
PO BOX 136, ALTOONA, PA 16603-0136
PO BOX 137, ALTOONA, PA 16603-0137
PO BOX 138, ALTOONA, PA 16603-0138
PO BOX 139, ALTOONA, PA 16603-0139
PO BOX 140, ALTOONA, PA 16603-0140
PO BOX 141, ALTOONA, PA 16603-0141
PO BOX 142, ALTOONA, PA 16603-0142
PO BOX 143, ALTOONA, PA 16603-0143
PO BOX 144, ALTOONA, PA 16603-0144
PO BOX 145, ALTOONA, PA 16603-0145
PO BOX 146, ALTOONA, PA 16603-0146
PO BOX 147, ALTOONA, PA 16603-0147
PO BOX 148, ALTOONA, PA 16603-0148
PO BOX 149, ALTOONA, PA 16603-0149
PO BOX 150, ALTOONA, PA 16603-0150
PO BOX 151, ALTOONA, PA 16603-0151
PO BOX 152, ALTOONA, PA 16603-0152
PO BOX 153, ALTOONA, PA 16603-0153
PO BOX 154, ALTOONA, PA 16603-0154
PO BOX 155, ALTOONA, PA 16603-0155
PO BOX 156, ALTOONA, PA 16603-0156
PO BOX 157, ALTOONA, PA 16603-0157
PO BOX 158, ALTOONA, PA 16603-0158
PO BOX 159, ALTOONA, PA 16603-0159
PO BOX 160, ALTOONA, PA 16603-0160
PO BOX 161, ALTOONA, PA 16603-0161
PO BOX 162, ALTOONA, PA 16603-0162
PO BOX 163, ALTOONA, PA 16603-0163
PO BOX 164, ALTOONA, PA 16603-0164
PO BOX 165, ALTOONA, PA 16603-0165
PO BOX 166, ALTOONA, PA 16603-0166
PO BOX 167, ALTOONA, PA 16603-0167
PO BOX 168, ALTOONA, PA 16603-0168
PO BOX 169, ALTOONA, PA 16603-0169
PO BOX 170, ALTOONA, PA 16603-0170
PO BOX 171, ALTOONA, PA 16603-0171
PO BOX 172, ALTOONA, PA 16603-0172
PO BOX 173, ALTOONA, PA 16603-0173
PO BOX 174, ALTOONA, PA 16603-0174
PO BOX 175, ALTOONA, PA 16603-0175
PO BOX 176, ALTOONA, PA 16603-0176
PO BOX 177, ALTOONA, PA 16603-0177
PO BOX 178, ALTOONA, PA 16603-0178
PO BOX 179, ALTOONA, PA 16603-0179
PO BOX 180, ALTOONA, PA 16603-0180
PO BOX 181, ALTOONA, PA 16603-0181
PO BOX 182, ALTOONA, PA 16603-0182
PO BOX 183, ALTOONA, PA 16603-0183
PO BOX 184, ALTOONA, PA 16603-0184
PO BOX 185, ALTOONA, PA 16603-0185
PO BOX 186, ALTOONA, PA 16603-0186
PO BOX 187, ALTOONA, PA 16603-0187
PO BOX 188, ALTOONA, PA 16603-0188
PO BOX 189, ALTOONA, PA 16603-0189
PO BOX 190, ALTOONA, PA 16603-0190
PO BOX 191, ALTOONA, PA 16603-0191
PO BOX 192, ALTOONA, PA 16603-0192
PO BOX 193, ALTOONA, PA 16603-0193
PO BOX 194, ALTOONA, PA 16603-0194
PO BOX 195, ALTOONA, PA 16603-0195
PO BOX 196, ALTOONA, PA 16603-0196
PO BOX 197, ALTOONA, PA 16603-0197
PO BOX 198, ALTOONA, PA 16603-0198
PO BOX 199, ALTOONA, PA 16603-0199
PO BOX 200, ALTOONA, PA 16603-0200
PO BOX 201, ALTOONA, PA 16603-0201
PO BOX 202, ALTOONA, PA 16603-0202
PO BOX 203, ALTOONA, PA 16603-0203
PO BOX 204, ALTOONA, PA 16603-0204
PO BOX 205, ALTOONA, PA 16603-0205
PO BOX 206, ALTOONA, PA 16603-0206
PO BOX 207, ALTOONA, PA 16603-0207
PO BOX 208, ALTOONA, PA 16603-0208
PO BOX 209, ALTOONA, PA 16603-0209
PO BOX 210, ALTOONA, PA 16603-0210
PO BOX 211, ALTOONA, PA 16603-0211
PO BOX 212, ALTOONA, PA 16603-0212
PO BOX 213, ALTOONA, PA 16603-0213
PO BOX 214, ALTOONA, PA 16603-0214
PO BOX 215, ALTOONA, PA 16603-0215
PO BOX 216, ALTOONA, PA 16603-0216
PO BOX 217, ALTOONA, PA 16603-0217
PO BOX 218, ALTOONA, PA 16603-0218
PO BOX 219, ALTOONA, PA 16603-0219
PO BOX 220, ALTOONA, PA 16603-0220
PO BOX 221, ALTOONA, PA 16603-0221
PO BOX 222, ALTOONA, PA 16603-0222
PO BOX 223, ALTOONA, PA 16603-0223
PO BOX 224, ALTOONA, PA 16603-0224
PO BOX 225, ALTOONA, PA 16603-0225
PO BOX 226, ALTOONA, PA 16603-0226
PO BOX 227, ALTOONA, PA 16603-0227
PO BOX 228, ALTOONA, PA 16603-0228
PO BOX 229, ALTOONA, PA 16603-0229
PO BOX 230, ALTOONA, PA 16603-0230
PO BOX 231, ALTOONA, PA 16603-0231
PO BOX 232, ALTOONA, PA 16603-0232
PO BOX 233, ALTOONA, PA 16603-0233
PO BOX 234, ALTOONA, PA 16603-0234
PO BOX 235, ALTOONA, PA 16603-0235
PO BOX 236, ALTOONA, PA 16603-0236
PO BOX 237, ALTOONA, PA 16603-0237
PO BOX 238, ALTOONA, PA 16603-0238
PO BOX 239, ALTOONA, PA 16603-0239
PO BOX 240, ALTOONA, PA 16603-0240
PO BOX 241, ALTOONA, PA 16603-0241
PO BOX 242, ALTOONA, PA 16603-0242
PO BOX 243, ALTOONA, PA 16603-0243
PO BOX 244, ALTOONA, PA 16603-0244
PO BOX 245, ALTOONA, PA 16603-0245
PO BOX 246, ALTOONA, PA 16603-0246
PO BOX 247, ALTOONA, PA 16603-0247
PO BOX 248, ALTOONA, PA 16603-0248
PO BOX 249, ALTOONA, PA 16603-0249
PO BOX 250, ALTOONA, PA 16603-0250
PO BOX 251, ALTOONA, PA 16603-0251
PO BOX 252, ALTOONA, PA 16603-0252
PO BOX 253, ALTOONA, PA 16603-0253
PO BOX 254, ALTOONA, PA 16603-0254
PO BOX 255, ALTOONA, PA 16603-0255
PO BOX 256, ALTOONA, PA 16603-0256
PO BOX 257, ALTOONA, PA 16603-0257
PO BOX 258, ALTOONA, PA 16603-0258
PO BOX 259, ALTOONA, PA 16603-0259
PO BOX 260, ALTOONA, PA 16603-0260
PO BOX 261, ALTOONA, PA 16603-0261
PO BOX 262, ALTOONA, PA 16603-0262
PO BOX 263, ALTOONA, PA 16603-0263
PO BOX 264, ALTOONA, PA 16603-0264
PO BOX 265, ALTOONA, PA 16603-0265
PO BOX 266, ALTOONA, PA 16603-0266
PO BOX 267, ALTOONA, PA 16603-0267
PO BOX 268, ALTOONA, PA 16603-0268
PO BOX 269, ALTOONA, PA 16603-0269
PO BOX 270, ALTOONA, PA 16603-0270
PO BOX 271, ALTOONA, PA 16603-0271
PO BOX 272, ALTOONA, PA 16603-0272
PO BOX 273, ALTOONA, PA 16603-0273
PO BOX 274, ALTOONA, PA 16603-0274
PO BOX 275, ALTOONA, PA 16603-0275
PO BOX 276, ALTOONA, PA 16603-0276
PO BOX 277, ALTOONA, PA 16603-0277
PO BOX 278, ALTOONA, PA 16603-0278
PO BOX 279, ALTOONA, PA 16603-0279
PO BOX 280, ALTOONA, PA 16603-0280
PO BOX 281, ALTOONA, PA 16603-0281
PO BOX 282, ALTOONA, PA 16603-0282
PO BOX 283, ALTOONA, PA 16603-0283
PO BOX 284, ALTOONA, PA 16603-0284
PO BOX 285, ALTOONA, PA 16603-0285
PO BOX 286, ALTOONA, PA 16603-0286
PO BOX 287, ALTOONA, PA 16603-0287
PO BOX 288, ALTOONA, PA 16603-0288
PO BOX 289, ALTOONA, PA 16603-0289
PO BOX 290, ALTOONA, PA 16603-0290
PO BOX 291, ALTOONA, PA 16603-0291
PO BOX 292, ALTOONA, PA 16603-0292
PO BOX 293, ALTOONA, PA 16603-0293
PO BOX 294, ALTOONA, PA 16603-0294
PO BOX 295, ALTOONA, PA 16603-0295
PO BOX 296, ALTOONA, PA 16603-0296
PO BOX 297, ALTOONA, PA 16603-0297
PO BOX 298, ALTOONA, PA 16603-0298
PO BOX 299, ALTOONA, PA 16603-0299
PO BOX 300, ALTOONA, PA 16603-0300
PO BOX 301, ALTOONA, PA 16603-0301
PO BOX 302, ALTOONA, PA 16603-0302
PO BOX 303, ALTOONA, PA 16603-0303
PO BOX 304, ALTOONA, PA 16603-0304
PO BOX 305, ALTOONA, PA 16603-0305
PO BOX 306, ALTOONA, PA 16603-0306
PO BOX 307, ALTOONA, PA 16603-0307
PO BOX 308, ALTOONA, PA 16603-0308
PO BOX 309, ALTOONA, PA 16603-0309
PO BOX 310, ALTOONA, PA 16603-0310
PO BOX 311, ALTOONA, PA 16603-0311
PO BOX 312, ALTOONA, PA 16603-0312
PO BOX 313, ALTOONA, PA 16603-0313
PO BOX 314, ALTOONA, PA 16603-0314
PO BOX 315, ALTOONA, PA 16603-0315
PO BOX 316, ALTOONA, PA 16603-0316
PO BOX 317, ALTOONA, PA 16603-0317
PO BOX 318, ALTOONA, PA 16603-0318
PO BOX 319, ALTOONA, PA 16603-0319
PO BOX 320, ALTOONA, PA 16603-0320
PO BOX 321, ALTOONA, PA 16603-0321
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