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 12271, SANTA BARBARA, CA 93107-2271
PO BOX 12272, SANTA BARBARA, CA 93107-2272
PO BOX 12273, SANTA BARBARA, CA 93107-2273
PO BOX 12274, SANTA BARBARA, CA 93107-2274
PO BOX 12275, SANTA BARBARA, CA 93107-2275
PO BOX 12276, SANTA BARBARA, CA 93107-2276
PO BOX 12277, SANTA BARBARA, CA 93107-2277
PO BOX 12278, SANTA BARBARA, CA 93107-2278
PO BOX 12279, SANTA BARBARA, CA 93107-2279
PO BOX 12280, SANTA BARBARA, CA 93107-2280
PO BOX 12281, SANTA BARBARA, CA 93107-2281
PO BOX 12282, SANTA BARBARA, CA 93107-2282
PO BOX 12283, SANTA BARBARA, CA 93107-2283
PO BOX 12284, SANTA BARBARA, CA 93107-2284
PO BOX 12285, SANTA BARBARA, CA 93107-2285
PO BOX 12286, SANTA BARBARA, CA 93107-2286
PO BOX 12287, SANTA BARBARA, CA 93107-2287
PO BOX 12288, SANTA BARBARA, CA 93107-2288
PO BOX 12289, SANTA BARBARA, CA 93107-2289
PO BOX 12290, SANTA BARBARA, CA 93107-2290
PO BOX 12291, SANTA BARBARA, CA 93107-2291
PO BOX 12292, SANTA BARBARA, CA 93107-2292
PO BOX 12293, SANTA BARBARA, CA 93107-2293
PO BOX 12294, SANTA BARBARA, CA 93107-2294
PO BOX 12295, SANTA BARBARA, CA 93107-2295
PO BOX 12296, SANTA BARBARA, CA 93107-2296
PO BOX 12297, SANTA BARBARA, CA 93107-2297
PO BOX 12298, SANTA BARBARA, CA 93107-2298
PO BOX 12299, SANTA BARBARA, CA 93107-2299
PO BOX 12300, SANTA BARBARA, CA 93107-2300
PO BOX 12301, SANTA BARBARA, CA 93107-2301
PO BOX 12302, SANTA BARBARA, CA 93107-2302
PO BOX 12303, SANTA BARBARA, CA 93107-2303
PO BOX 12304, SANTA BARBARA, CA 93107-2304
PO BOX 12305, SANTA BARBARA, CA 93107-2305
PO BOX 12306, SANTA BARBARA, CA 93107-2306
PO BOX 12307, SANTA BARBARA, CA 93107-2307
PO BOX 12308, SANTA BARBARA, CA 93107-2308
PO BOX 12309, SANTA BARBARA, CA 93107-2309
PO BOX 12310, SANTA BARBARA, CA 93107-2310
PO BOX 12311, SANTA BARBARA, CA 93107-2311
PO BOX 12312, SANTA BARBARA, CA 93107-2312
PO BOX 12313, SANTA BARBARA, CA 93107-2313
PO BOX 12314, SANTA BARBARA, CA 93107-2314
PO BOX 12315, SANTA BARBARA, CA 93107-2315
PO BOX 12316, SANTA BARBARA, CA 93107-2316
PO BOX 12317, SANTA BARBARA, CA 93107-2317
PO BOX 12318, SANTA BARBARA, CA 93107-2318
PO BOX 12319, SANTA BARBARA, CA 93107-2319
PO BOX 12320, SANTA BARBARA, CA 93107-2320
PO BOX 12321, SANTA BARBARA, CA 93107-2321
PO BOX 12322, SANTA BARBARA, CA 93107-2322
PO BOX 12323, SANTA BARBARA, CA 93107-2323
PO BOX 12324, SANTA BARBARA, CA 93107-2324
PO BOX 12325, SANTA BARBARA, CA 93107-2325
PO BOX 12326, SANTA BARBARA, CA 93107-2326
PO BOX 12327, SANTA BARBARA, CA 93107-2327
PO BOX 12328, SANTA BARBARA, CA 93107-2328
PO BOX 12329, SANTA BARBARA, CA 93107-2329
PO BOX 12330, SANTA BARBARA, CA 93107-2330
PO BOX 12331, SANTA BARBARA, CA 93107-2331
PO BOX 12332, SANTA BARBARA, CA 93107-2332
PO BOX 12333, SANTA BARBARA, CA 93107-2333
PO BOX 12334, SANTA BARBARA, CA 93107-2334
PO BOX 12335, SANTA BARBARA, CA 93107-2335
PO BOX 12336, SANTA BARBARA, CA 93107-2336
PO BOX 12337, SANTA BARBARA, CA 93107-2337
PO BOX 12338, SANTA BARBARA, CA 93107-2338
PO BOX 12339, SANTA BARBARA, CA 93107-2339
PO BOX 12340, SANTA BARBARA, CA 93107-2340
PO BOX 12341, SANTA BARBARA, CA 93107-2341
PO BOX 12342, SANTA BARBARA, CA 93107-2342
PO BOX 12343, SANTA BARBARA, CA 93107-2343
PO BOX 12344, SANTA BARBARA, CA 93107-2344
PO BOX 12345, SANTA BARBARA, CA 93107-2345
PO BOX 12346, SANTA BARBARA, CA 93107-2346
PO BOX 12347, SANTA BARBARA, CA 93107-2347
PO BOX 12348, SANTA BARBARA, CA 93107-2348
PO BOX 12349, SANTA BARBARA, CA 93107-2349
PO BOX 12350, SANTA BARBARA, CA 93107-2350
PO BOX 12351, SANTA BARBARA, CA 93107-2351
PO BOX 12352, SANTA BARBARA, CA 93107-2352
PO BOX 12353, SANTA BARBARA, CA 93107-2353
PO BOX 12354, SANTA BARBARA, CA 93107-2354
PO BOX 12355, SANTA BARBARA, CA 93107-2355
PO BOX 12356, SANTA BARBARA, CA 93107-2356
PO BOX 12357, SANTA BARBARA, CA 93107-2357
PO BOX 12358, SANTA BARBARA, CA 93107-2358
PO BOX 12359, SANTA BARBARA, CA 93107-2359
PO BOX 12360, SANTA BARBARA, CA 93107-2360
PO BOX 12361, SANTA BARBARA, CA 93107-2361
PO BOX 12362, SANTA BARBARA, CA 93107-2362
PO BOX 12363, SANTA BARBARA, CA 93107-2363
PO BOX 12364, SANTA BARBARA, CA 93107-2364
PO BOX 12365, SANTA BARBARA, CA 93107-2365
PO BOX 12366, SANTA BARBARA, CA 93107-2366
PO BOX 12367, SANTA BARBARA, CA 93107-2367
PO BOX 12368, SANTA BARBARA, CA 93107-2368
PO BOX 12369, SANTA BARBARA, CA 93107-2369
PO BOX 12370, SANTA BARBARA, CA 93107-2370
PO BOX 12371, SANTA BARBARA, CA 93107-2371
PO BOX 12372, SANTA BARBARA, CA 93107-2372
PO BOX 12373, SANTA BARBARA, CA 93107-2373
PO BOX 12374, SANTA BARBARA, CA 93107-2374
PO BOX 12375, SANTA BARBARA, CA 93107-2375
PO BOX 12376, SANTA BARBARA, CA 93107-2376
PO BOX 12377, SANTA BARBARA, CA 93107-2377
PO BOX 12378, SANTA BARBARA, CA 93107-2378
PO BOX 12379, SANTA BARBARA, CA 93107-2379
PO BOX 12380, SANTA BARBARA, CA 93107-2380
PO BOX 12381, SANTA BARBARA, CA 93107-2381
PO BOX 12382, SANTA BARBARA, CA 93107-2382
PO BOX 12383, SANTA BARBARA, CA 93107-2383
PO BOX 12384, SANTA BARBARA, CA 93107-2384
PO BOX 12385, SANTA BARBARA, CA 93107-2385
PO BOX 12386, SANTA BARBARA, CA 93107-2386
PO BOX 12387, SANTA BARBARA, CA 93107-2387
PO BOX 12388, SANTA BARBARA, CA 93107-2388
PO BOX 12389, SANTA BARBARA, CA 93107-2389
PO BOX 12390, SANTA BARBARA, CA 93107-2390
PO BOX 12391, SANTA BARBARA, CA 93107-2391
PO BOX 12392, SANTA BARBARA, CA 93107-2392
PO BOX 12393, SANTA BARBARA, CA 93107-2393
PO BOX 12394, SANTA BARBARA, CA 93107-2394
PO BOX 12395, SANTA BARBARA, CA 93107-2395
PO BOX 12396, SANTA BARBARA, CA 93107-2396
PO BOX 12397, SANTA BARBARA, CA 93107-2397
PO BOX 12398, SANTA BARBARA, CA 93107-2398
PO BOX 12399, SANTA BARBARA, CA 93107-2399
PO BOX 12400, SANTA BARBARA, CA 93107-2400
PO BOX 12401, SANTA BARBARA, CA 93107-2401
PO BOX 12402, SANTA BARBARA, CA 93107-2402
PO BOX 12403, SANTA BARBARA, CA 93107-2403
PO BOX 12404, SANTA BARBARA, CA 93107-2404
PO BOX 12405, SANTA BARBARA, CA 93107-2405
PO BOX 12406, SANTA BARBARA, CA 93107-2406
PO BOX 12407, SANTA BARBARA, CA 93107-2407
PO BOX 12408, SANTA BARBARA, CA 93107-2408
PO BOX 12409, SANTA BARBARA, CA 93107-2409
PO BOX 12410, SANTA BARBARA, CA 93107-2410
PO BOX 12411, SANTA BARBARA, CA 93107-2411
PO BOX 12412, SANTA BARBARA, CA 93107-2412
PO BOX 12413, SANTA BARBARA, CA 93107-2413
PO BOX 12414, SANTA BARBARA, CA 93107-2414
PO BOX 12415, SANTA BARBARA, CA 93107-2415
PO BOX 12416, SANTA BARBARA, CA 93107-2416
PO BOX 12417, SANTA BARBARA, CA 93107-2417
PO BOX 12418, SANTA BARBARA, CA 93107-2418
PO BOX 12419, SANTA BARBARA, CA 93107-2419
PO BOX 12420, SANTA BARBARA, CA 93107-2420
PO BOX 12421, SANTA BARBARA, CA 93107-2421
PO BOX 12422, SANTA BARBARA, CA 93107-2422
PO BOX 12423, SANTA BARBARA, CA 93107-2423
PO BOX 12424, SANTA BARBARA, CA 93107-2424
PO BOX 12425, SANTA BARBARA, CA 93107-2425
PO BOX 12426, SANTA BARBARA, CA 93107-2426
PO BOX 12427, SANTA BARBARA, CA 93107-2427
PO BOX 12428, SANTA BARBARA, CA 93107-2428
PO BOX 12429, SANTA BARBARA, CA 93107-2429
PO BOX 12430, SANTA BARBARA, CA 93107-2430
PO BOX 12431, SANTA BARBARA, CA 93107-2431
PO BOX 12432, SANTA BARBARA, CA 93107-2432
PO BOX 12433, SANTA BARBARA, CA 93107-2433
PO BOX 12434, SANTA BARBARA, CA 93107-2434
PO BOX 12435, SANTA BARBARA, CA 93107-2435
PO BOX 12436, SANTA BARBARA, CA 93107-2436
PO BOX 12437, SANTA BARBARA, CA 93107-2437
PO BOX 12438, SANTA BARBARA, CA 93107-2438
PO BOX 12439, SANTA BARBARA, CA 93107-2439
PO BOX 12440, SANTA BARBARA, CA 93107-2440
PO BOX 12441, SANTA BARBARA, CA 93107-2441
PO BOX 12442, SANTA BARBARA, CA 93107-2442
PO BOX 12443, SANTA BARBARA, CA 93107-2443
PO BOX 12444, SANTA BARBARA, CA 93107-2444
PO BOX 12445, SANTA BARBARA, CA 93107-2445
PO BOX 12446, SANTA BARBARA, CA 93107-2446
PO BOX 12447, SANTA BARBARA, CA 93107-2447
PO BOX 12448, SANTA BARBARA, CA 93107-2448
PO BOX 12449, SANTA BARBARA, CA 93107-2449
PO BOX 12450, SANTA BARBARA, CA 93107-2450
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