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 2301, CALIFORNIA CITY, CA 93504-0301
PO BOX 2302, CALIFORNIA CITY, CA 93504-0302
PO BOX 2303, CALIFORNIA CITY, CA 93504-0303
PO BOX 2304, CALIFORNIA CITY, CA 93504-0304
PO BOX 2305, CALIFORNIA CITY, CA 93504-0305
PO BOX 2306, CALIFORNIA CITY, CA 93504-0306
PO BOX 2307, CALIFORNIA CITY, CA 93504-0307
PO BOX 2308, CALIFORNIA CITY, CA 93504-0308
PO BOX 2309, CALIFORNIA CITY, CA 93504-0309
PO BOX 2310, CALIFORNIA CITY, CA 93504-0310
PO BOX 2311, CALIFORNIA CITY, CA 93504-0311
PO BOX 2312, CALIFORNIA CITY, CA 93504-0312
PO BOX 2313, CALIFORNIA CITY, CA 93504-0313
PO BOX 2314, CALIFORNIA CITY, CA 93504-0314
PO BOX 2315, CALIFORNIA CITY, CA 93504-0315
PO BOX 2316, CALIFORNIA CITY, CA 93504-0316
PO BOX 2317, CALIFORNIA CITY, CA 93504-0317
PO BOX 2318, CALIFORNIA CITY, CA 93504-0318
PO BOX 2319, CALIFORNIA CITY, CA 93504-0319
PO BOX 2320, CALIFORNIA CITY, CA 93504-0320
PO BOX 2321, CALIFORNIA CITY, CA 93504-0321
PO BOX 2322, CALIFORNIA CITY, CA 93504-0322
PO BOX 2323, CALIFORNIA CITY, CA 93504-0323
PO BOX 2324, CALIFORNIA CITY, CA 93504-0324
PO BOX 2325, CALIFORNIA CITY, CA 93504-0325
PO BOX 2326, CALIFORNIA CITY, CA 93504-0326
PO BOX 2327, CALIFORNIA CITY, CA 93504-0327
PO BOX 2328, CALIFORNIA CITY, CA 93504-0328
PO BOX 2329, CALIFORNIA CITY, CA 93504-0329
PO BOX 2330, CALIFORNIA CITY, CA 93504-0330
PO BOX 2331, CALIFORNIA CITY, CA 93504-0331
PO BOX 2332, CALIFORNIA CITY, CA 93504-0332
PO BOX 2333, CALIFORNIA CITY, CA 93504-0333
PO BOX 2334, CALIFORNIA CITY, CA 93504-0334
PO BOX 2335, CALIFORNIA CITY, CA 93504-0335
PO BOX 2336, CALIFORNIA CITY, CA 93504-0336
PO BOX 2337, CALIFORNIA CITY, CA 93504-0337
PO BOX 2338, CALIFORNIA CITY, CA 93504-0338
PO BOX 2339, CALIFORNIA CITY, CA 93504-0339
PO BOX 2340, CALIFORNIA CITY, CA 93504-0340
PO BOX 2341, CALIFORNIA CITY, CA 93504-0341
PO BOX 2342, CALIFORNIA CITY, CA 93504-0342
PO BOX 2343, CALIFORNIA CITY, CA 93504-0343
PO BOX 2344, CALIFORNIA CITY, CA 93504-0344
PO BOX 2345, CALIFORNIA CITY, CA 93504-0345
PO BOX 2346, CALIFORNIA CITY, CA 93504-0346
PO BOX 2347, CALIFORNIA CITY, CA 93504-0347
PO BOX 2348, CALIFORNIA CITY, CA 93504-0348
PO BOX 2349, CALIFORNIA CITY, CA 93504-0349
PO BOX 2350, CALIFORNIA CITY, CA 93504-0350
PO BOX 2351, CALIFORNIA CITY, CA 93504-0351
PO BOX 2352, CALIFORNIA CITY, CA 93504-0352
PO BOX 2353, CALIFORNIA CITY, CA 93504-0353
PO BOX 2354, CALIFORNIA CITY, CA 93504-0354
PO BOX 2355, CALIFORNIA CITY, CA 93504-0355
PO BOX 2356, CALIFORNIA CITY, CA 93504-0356
PO BOX 2357, CALIFORNIA CITY, CA 93504-0357
PO BOX 2358, CALIFORNIA CITY, CA 93504-0358
PO BOX 2359, CALIFORNIA CITY, CA 93504-0359
PO BOX 2360, CALIFORNIA CITY, CA 93504-0360
PO BOX 2361, CALIFORNIA CITY, CA 93504-0361
PO BOX 2362, CALIFORNIA CITY, CA 93504-0362
PO BOX 2363, CALIFORNIA CITY, CA 93504-0363
PO BOX 2364, CALIFORNIA CITY, CA 93504-0364
PO BOX 2365, CALIFORNIA CITY, CA 93504-0365
PO BOX 2366, CALIFORNIA CITY, CA 93504-0366
PO BOX 2367, CALIFORNIA CITY, CA 93504-0367
PO BOX 2368, CALIFORNIA CITY, CA 93504-0368
PO BOX 2369, CALIFORNIA CITY, CA 93504-0369
PO BOX 2370, CALIFORNIA CITY, CA 93504-0370
PO BOX 2371, CALIFORNIA CITY, CA 93504-0371
PO BOX 2372, CALIFORNIA CITY, CA 93504-0372
PO BOX 2373, CALIFORNIA CITY, CA 93504-0373
PO BOX 2374, CALIFORNIA CITY, CA 93504-0374
PO BOX 2375, CALIFORNIA CITY, CA 93504-0375
PO BOX 2376, CALIFORNIA CITY, CA 93504-0376
PO BOX 2377, CALIFORNIA CITY, CA 93504-0377
PO BOX 2378, CALIFORNIA CITY, CA 93504-0378
PO BOX 2379, CALIFORNIA CITY, CA 93504-0379
PO BOX 2380, CALIFORNIA CITY, CA 93504-0380
PO BOX 2381, CALIFORNIA CITY, CA 93504-0381
PO BOX 2382, CALIFORNIA CITY, CA 93504-0382
PO BOX 2383, CALIFORNIA CITY, CA 93504-0383
PO BOX 2384, CALIFORNIA CITY, CA 93504-0384
PO BOX 2385, CALIFORNIA CITY, CA 93504-0385
PO BOX 2386, CALIFORNIA CITY, CA 93504-0386
PO BOX 2387, CALIFORNIA CITY, CA 93504-0387
PO BOX 2388, CALIFORNIA CITY, CA 93504-0388
PO BOX 2389, CALIFORNIA CITY, CA 93504-0389
PO BOX 2390, CALIFORNIA CITY, CA 93504-0390
PO BOX 2391, CALIFORNIA CITY, CA 93504-0391
PO BOX 2392, CALIFORNIA CITY, CA 93504-0392
PO BOX 2393, CALIFORNIA CITY, CA 93504-0393
PO BOX 2394, CALIFORNIA CITY, CA 93504-0394
PO BOX 2395, CALIFORNIA CITY, CA 93504-0395
PO BOX 2396, CALIFORNIA CITY, CA 93504-0396
PO BOX 2397, CALIFORNIA CITY, CA 93504-0397
PO BOX 2398, CALIFORNIA CITY, CA 93504-0398
PO BOX 2399, CALIFORNIA CITY, CA 93504-0399
PO BOX 2400, CALIFORNIA CITY, CA 93504-0400
PO BOX 2401, CALIFORNIA CITY, CA 93504-0401
PO BOX 2402, CALIFORNIA CITY, CA 93504-0402
PO BOX 2403, CALIFORNIA CITY, CA 93504-0403
PO BOX 2404, CALIFORNIA CITY, CA 93504-0404
PO BOX 2405, CALIFORNIA CITY, CA 93504-0405
PO BOX 2406, CALIFORNIA CITY, CA 93504-0406
PO BOX 2407, CALIFORNIA CITY, CA 93504-0407
PO BOX 2408, CALIFORNIA CITY, CA 93504-0408
PO BOX 2409, CALIFORNIA CITY, CA 93504-0409
PO BOX 2410, CALIFORNIA CITY, CA 93504-0410
PO BOX 2411, CALIFORNIA CITY, CA 93504-0411
PO BOX 2412, CALIFORNIA CITY, CA 93504-0412
PO BOX 2413, CALIFORNIA CITY, CA 93504-0413
PO BOX 2414, CALIFORNIA CITY, CA 93504-0414
PO BOX 2415, CALIFORNIA CITY, CA 93504-0415
PO BOX 2416, CALIFORNIA CITY, CA 93504-0416
PO BOX 2417, CALIFORNIA CITY, CA 93504-0417
PO BOX 2418, CALIFORNIA CITY, CA 93504-0418
PO BOX 2419, CALIFORNIA CITY, CA 93504-0419
PO BOX 2420, CALIFORNIA CITY, CA 93504-0420
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