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 201, SOUTH SAN FRANCISCO, CA 94083-0201
PO BOX 202, SOUTH SAN FRANCISCO, CA 94083-0202
PO BOX 203, SOUTH SAN FRANCISCO, CA 94083-0203
PO BOX 204, SOUTH SAN FRANCISCO, CA 94083-0204
PO BOX 205, SOUTH SAN FRANCISCO, CA 94083-0205
PO BOX 206, SOUTH SAN FRANCISCO, CA 94083-0206
PO BOX 207, SOUTH SAN FRANCISCO, CA 94083-0207
PO BOX 208, SOUTH SAN FRANCISCO, CA 94083-0208
PO BOX 209, SOUTH SAN FRANCISCO, CA 94083-0209
PO BOX 210, SOUTH SAN FRANCISCO, CA 94083-0210
PO BOX 211, SOUTH SAN FRANCISCO, CA 94083-0211
PO BOX 212, SOUTH SAN FRANCISCO, CA 94083-0212
PO BOX 213, SOUTH SAN FRANCISCO, CA 94083-0213
PO BOX 214, SOUTH SAN FRANCISCO, CA 94083-0214
PO BOX 215, SOUTH SAN FRANCISCO, CA 94083-0215
PO BOX 216, SOUTH SAN FRANCISCO, CA 94083-0216
PO BOX 217, SOUTH SAN FRANCISCO, CA 94083-0217
PO BOX 218, SOUTH SAN FRANCISCO, CA 94083-0218
PO BOX 219, SOUTH SAN FRANCISCO, CA 94083-0219
PO BOX 220, SOUTH SAN FRANCISCO, CA 94083-0220
PO BOX 221, SOUTH SAN FRANCISCO, CA 94083-0221
PO BOX 222, SOUTH SAN FRANCISCO, CA 94083-0222
PO BOX 223, SOUTH SAN FRANCISCO, CA 94083-0223
PO BOX 224, SOUTH SAN FRANCISCO, CA 94083-0224
PO BOX 225, SOUTH SAN FRANCISCO, CA 94083-0225
PO BOX 226, SOUTH SAN FRANCISCO, CA 94083-0226
PO BOX 227, SOUTH SAN FRANCISCO, CA 94083-0227
PO BOX 228, SOUTH SAN FRANCISCO, CA 94083-0228
PO BOX 229, SOUTH SAN FRANCISCO, CA 94083-0229
PO BOX 230, SOUTH SAN FRANCISCO, CA 94083-0230
PO BOX 231, SOUTH SAN FRANCISCO, CA 94083-0231
PO BOX 232, SOUTH SAN FRANCISCO, CA 94083-0232
PO BOX 233, SOUTH SAN FRANCISCO, CA 94083-0233
PO BOX 234, SOUTH SAN FRANCISCO, CA 94083-0234
PO BOX 235, SOUTH SAN FRANCISCO, CA 94083-0235
PO BOX 236, SOUTH SAN FRANCISCO, CA 94083-0236
PO BOX 237, SOUTH SAN FRANCISCO, CA 94083-0237
PO BOX 238, SOUTH SAN FRANCISCO, CA 94083-0238
PO BOX 239, SOUTH SAN FRANCISCO, CA 94083-0239
PO BOX 240, SOUTH SAN FRANCISCO, CA 94083-0240
PO BOX 241, SOUTH SAN FRANCISCO, CA 94083-0241
PO BOX 242, SOUTH SAN FRANCISCO, CA 94083-0242
PO BOX 243, SOUTH SAN FRANCISCO, CA 94083-0243
PO BOX 244, SOUTH SAN FRANCISCO, CA 94083-0244
PO BOX 245, SOUTH SAN FRANCISCO, CA 94083-0245
PO BOX 246, SOUTH SAN FRANCISCO, CA 94083-0246
PO BOX 247, SOUTH SAN FRANCISCO, CA 94083-0247
PO BOX 248, SOUTH SAN FRANCISCO, CA 94083-0248
PO BOX 249, SOUTH SAN FRANCISCO, CA 94083-0249
PO BOX 250, SOUTH SAN FRANCISCO, CA 94083-0250
PO BOX 251, SOUTH SAN FRANCISCO, CA 94083-0251
PO BOX 252, SOUTH SAN FRANCISCO, CA 94083-0252
PO BOX 253, SOUTH SAN FRANCISCO, CA 94083-0253
PO BOX 254, SOUTH SAN FRANCISCO, CA 94083-0254
PO BOX 255, SOUTH SAN FRANCISCO, CA 94083-0255
PO BOX 256, SOUTH SAN FRANCISCO, CA 94083-0256
PO BOX 257, SOUTH SAN FRANCISCO, CA 94083-0257
PO BOX 258, SOUTH SAN FRANCISCO, CA 94083-0258
PO BOX 259, SOUTH SAN FRANCISCO, CA 94083-0259
PO BOX 260, SOUTH SAN FRANCISCO, CA 94083-0260
PO BOX 261, SOUTH SAN FRANCISCO, CA 94083-0261
PO BOX 262, SOUTH SAN FRANCISCO, CA 94083-0262
PO BOX 263, SOUTH SAN FRANCISCO, CA 94083-0263
PO BOX 264, SOUTH SAN FRANCISCO, CA 94083-0264
PO BOX 265, SOUTH SAN FRANCISCO, CA 94083-0265
PO BOX 266, SOUTH SAN FRANCISCO, CA 94083-0266
PO BOX 267, SOUTH SAN FRANCISCO, CA 94083-0267
PO BOX 268, SOUTH SAN FRANCISCO, CA 94083-0268
PO BOX 269, SOUTH SAN FRANCISCO, CA 94083-0269
PO BOX 270, SOUTH SAN FRANCISCO, CA 94083-0270
PO BOX 271, SOUTH SAN FRANCISCO, CA 94083-0271
PO BOX 272, SOUTH SAN FRANCISCO, CA 94083-0272
PO BOX 273, SOUTH SAN FRANCISCO, CA 94083-0273
PO BOX 274, SOUTH SAN FRANCISCO, CA 94083-0274
PO BOX 275, SOUTH SAN FRANCISCO, CA 94083-0275
PO BOX 276, SOUTH SAN FRANCISCO, CA 94083-0276
PO BOX 277, SOUTH SAN FRANCISCO, CA 94083-0277
PO BOX 278, SOUTH SAN FRANCISCO, CA 94083-0278
PO BOX 279, SOUTH SAN FRANCISCO, CA 94083-0279
PO BOX 280, SOUTH SAN FRANCISCO, CA 94083-0280
PO BOX 281, SOUTH SAN FRANCISCO, CA 94083-0281
PO BOX 282, SOUTH SAN FRANCISCO, CA 94083-0282
PO BOX 283, SOUTH SAN FRANCISCO, CA 94083-0283
PO BOX 284, SOUTH SAN FRANCISCO, CA 94083-0284
PO BOX 285, SOUTH SAN FRANCISCO, CA 94083-0285
PO BOX 286, SOUTH SAN FRANCISCO, CA 94083-0286
PO BOX 287, SOUTH SAN FRANCISCO, CA 94083-0287
PO BOX 288, SOUTH SAN FRANCISCO, CA 94083-0288
PO BOX 289, SOUTH SAN FRANCISCO, CA 94083-0289
PO BOX 290, SOUTH SAN FRANCISCO, CA 94083-0290
PO BOX 291, SOUTH SAN FRANCISCO, CA 94083-0291
PO BOX 292, SOUTH SAN FRANCISCO, CA 94083-0292
PO BOX 293, SOUTH SAN FRANCISCO, CA 94083-0293
PO BOX 294, SOUTH SAN FRANCISCO, CA 94083-0294
PO BOX 295, SOUTH SAN FRANCISCO, CA 94083-0295
PO BOX 296, SOUTH SAN FRANCISCO, CA 94083-0296
PO BOX 297, SOUTH SAN FRANCISCO, CA 94083-0297
PO BOX 298, SOUTH SAN FRANCISCO, CA 94083-0298
PO BOX 299, SOUTH SAN FRANCISCO, CA 94083-0299
PO BOX 300, SOUTH SAN FRANCISCO, CA 94083-0300
PO BOX 301, SOUTH SAN FRANCISCO, CA 94083-0301
PO BOX 302, SOUTH SAN FRANCISCO, CA 94083-0302
PO BOX 303, SOUTH SAN FRANCISCO, CA 94083-0303
PO BOX 304, SOUTH SAN FRANCISCO, CA 94083-0304
PO BOX 305, SOUTH SAN FRANCISCO, CA 94083-0305
PO BOX 306, SOUTH SAN FRANCISCO, CA 94083-0306
PO BOX 307, SOUTH SAN FRANCISCO, CA 94083-0307
PO BOX 308, SOUTH SAN FRANCISCO, CA 94083-0308
PO BOX 309, SOUTH SAN FRANCISCO, CA 94083-0309
PO BOX 310, SOUTH SAN FRANCISCO, CA 94083-0310
PO BOX 311, SOUTH SAN FRANCISCO, CA 94083-0311
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