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 11281, SANTA BARBARA, CA 93107-1281
PO BOX 11282, SANTA BARBARA, CA 93107-1282
PO BOX 11283, SANTA BARBARA, CA 93107-1283
PO BOX 11284, SANTA BARBARA, CA 93107-1284
PO BOX 11285, SANTA BARBARA, CA 93107-1285
PO BOX 11286, SANTA BARBARA, CA 93107-1286
PO BOX 11287, SANTA BARBARA, CA 93107-1287
PO BOX 11288, SANTA BARBARA, CA 93107-1288
PO BOX 11289, SANTA BARBARA, CA 93107-1289
PO BOX 11290, SANTA BARBARA, CA 93107-1290
PO BOX 11291, SANTA BARBARA, CA 93107-1291
PO BOX 11292, SANTA BARBARA, CA 93107-1292
PO BOX 11293, SANTA BARBARA, CA 93107-1293
PO BOX 11294, SANTA BARBARA, CA 93107-1294
PO BOX 11295, SANTA BARBARA, CA 93107-1295
PO BOX 11296, SANTA BARBARA, CA 93107-1296
PO BOX 11297, SANTA BARBARA, CA 93107-1297
PO BOX 11298, SANTA BARBARA, CA 93107-1298
PO BOX 11299, SANTA BARBARA, CA 93107-1299
PO BOX 11300, SANTA BARBARA, CA 93107-1300
PO BOX 11301, SANTA BARBARA, CA 93107-1301
PO BOX 11302, SANTA BARBARA, CA 93107-1302
PO BOX 11303, SANTA BARBARA, CA 93107-1303
PO BOX 11304, SANTA BARBARA, CA 93107-1304
PO BOX 11305, SANTA BARBARA, CA 93107-1305
PO BOX 11306, SANTA BARBARA, CA 93107-1306
PO BOX 11307, SANTA BARBARA, CA 93107-1307
PO BOX 11308, SANTA BARBARA, CA 93107-1308
PO BOX 11309, SANTA BARBARA, CA 93107-1309
PO BOX 11310, SANTA BARBARA, CA 93107-1310
PO BOX 11311, SANTA BARBARA, CA 93107-1311
PO BOX 11312, SANTA BARBARA, CA 93107-1312
PO BOX 11313, SANTA BARBARA, CA 93107-1313
PO BOX 11314, SANTA BARBARA, CA 93107-1314
PO BOX 11315, SANTA BARBARA, CA 93107-1315
PO BOX 11316, SANTA BARBARA, CA 93107-1316
PO BOX 11317, SANTA BARBARA, CA 93107-1317
PO BOX 11318, SANTA BARBARA, CA 93107-1318
PO BOX 11319, SANTA BARBARA, CA 93107-1319
PO BOX 11320, SANTA BARBARA, CA 93107-1320
PO BOX 11321, SANTA BARBARA, CA 93107-1321
PO BOX 11322, SANTA BARBARA, CA 93107-1322
PO BOX 11323, SANTA BARBARA, CA 93107-1323
PO BOX 11324, SANTA BARBARA, CA 93107-1324
PO BOX 11325, SANTA BARBARA, CA 93107-1325
PO BOX 11326, SANTA BARBARA, CA 93107-1326
PO BOX 11327, SANTA BARBARA, CA 93107-1327
PO BOX 11328, SANTA BARBARA, CA 93107-1328
PO BOX 11329, SANTA BARBARA, CA 93107-1329
PO BOX 11330, SANTA BARBARA, CA 93107-1330
PO BOX 11331, SANTA BARBARA, CA 93107-1331
PO BOX 11332, SANTA BARBARA, CA 93107-1332
PO BOX 11333, SANTA BARBARA, CA 93107-1333
PO BOX 11334, SANTA BARBARA, CA 93107-1334
PO BOX 11335, SANTA BARBARA, CA 93107-1335
PO BOX 11336, SANTA BARBARA, CA 93107-1336
PO BOX 11337, SANTA BARBARA, CA 93107-1337
PO BOX 11338, SANTA BARBARA, CA 93107-1338
PO BOX 11339, SANTA BARBARA, CA 93107-1339
PO BOX 11340, SANTA BARBARA, CA 93107-1340
PO BOX 11341, SANTA BARBARA, CA 93107-1341
PO BOX 11342, SANTA BARBARA, CA 93107-1342
PO BOX 11343, SANTA BARBARA, CA 93107-1343
PO BOX 11344, SANTA BARBARA, CA 93107-1344
PO BOX 11345, SANTA BARBARA, CA 93107-1345
PO BOX 11346, SANTA BARBARA, CA 93107-1346
PO BOX 11347, SANTA BARBARA, CA 93107-1347
PO BOX 11348, SANTA BARBARA, CA 93107-1348
PO BOX 11349, SANTA BARBARA, CA 93107-1349
PO BOX 11350, SANTA BARBARA, CA 93107-1350
PO BOX 11351, SANTA BARBARA, CA 93107-1351
PO BOX 11352, SANTA BARBARA, CA 93107-1352
PO BOX 11353, SANTA BARBARA, CA 93107-1353
PO BOX 11354, SANTA BARBARA, CA 93107-1354
PO BOX 11355, SANTA BARBARA, CA 93107-1355
PO BOX 11356, SANTA BARBARA, CA 93107-1356
PO BOX 11357, SANTA BARBARA, CA 93107-1357
PO BOX 11358, SANTA BARBARA, CA 93107-1358
PO BOX 11359, SANTA BARBARA, CA 93107-1359
PO BOX 11360, SANTA BARBARA, CA 93107-1360
PO BOX 11361, SANTA BARBARA, CA 93107-1361
PO BOX 11362, SANTA BARBARA, CA 93107-1362
PO BOX 11363, SANTA BARBARA, CA 93107-1363
PO BOX 11364, SANTA BARBARA, CA 93107-1364
PO BOX 11365, SANTA BARBARA, CA 93107-1365
PO BOX 11366, SANTA BARBARA, CA 93107-1366
PO BOX 11367, SANTA BARBARA, CA 93107-1367
PO BOX 11368, SANTA BARBARA, CA 93107-1368
PO BOX 11369, SANTA BARBARA, CA 93107-1369
PO BOX 11370, SANTA BARBARA, CA 93107-1370
PO BOX 11371, SANTA BARBARA, CA 93107-1371
PO BOX 11372, SANTA BARBARA, CA 93107-1372
PO BOX 11373, SANTA BARBARA, CA 93107-1373
PO BOX 11374, SANTA BARBARA, CA 93107-1374
PO BOX 11375, SANTA BARBARA, CA 93107-1375
PO BOX 11376, SANTA BARBARA, CA 93107-1376
PO BOX 11377, SANTA BARBARA, CA 93107-1377
PO BOX 11378, SANTA BARBARA, CA 93107-1378
PO BOX 11379, SANTA BARBARA, CA 93107-1379
PO BOX 11380, SANTA BARBARA, CA 93107-1380
PO BOX 11381, SANTA BARBARA, CA 93107-1381
PO BOX 11382, SANTA BARBARA, CA 93107-1382
PO BOX 11383, SANTA BARBARA, CA 93107-1383
PO BOX 11384, SANTA BARBARA, CA 93107-1384
PO BOX 11385, SANTA BARBARA, CA 93107-1385
PO BOX 11386, SANTA BARBARA, CA 93107-1386
PO BOX 11387, SANTA BARBARA, CA 93107-1387
PO BOX 11388, SANTA BARBARA, CA 93107-1388
PO BOX 11389, SANTA BARBARA, CA 93107-1389
PO BOX 11390, SANTA BARBARA, CA 93107-1390
PO BOX 11391, SANTA BARBARA, CA 93107-1391
PO BOX 11392, SANTA BARBARA, CA 93107-1392
PO BOX 11393, SANTA BARBARA, CA 93107-1393
PO BOX 11394, SANTA BARBARA, CA 93107-1394
PO BOX 11395, SANTA BARBARA, CA 93107-1395
PO BOX 11396, SANTA BARBARA, CA 93107-1396
PO BOX 11397, SANTA BARBARA, CA 93107-1397
PO BOX 11398, SANTA BARBARA, CA 93107-1398
PO BOX 11399, SANTA BARBARA, CA 93107-1399
PO BOX 11400, SANTA BARBARA, CA 93107-1400
PO BOX 11401, SANTA BARBARA, CA 93107-1401
PO BOX 11402, SANTA BARBARA, CA 93107-1402
PO BOX 11403, SANTA BARBARA, CA 93107-1403
PO BOX 11404, SANTA BARBARA, CA 93107-1404
PO BOX 11405, SANTA BARBARA, CA 93107-1405
PO BOX 11406, SANTA BARBARA, CA 93107-1406
PO BOX 11407, SANTA BARBARA, CA 93107-1407
PO BOX 11408, SANTA BARBARA, CA 93107-1408
PO BOX 11409, SANTA BARBARA, CA 93107-1409
PO BOX 11410, SANTA BARBARA, CA 93107-1410
PO BOX 11411, SANTA BARBARA, CA 93107-1411
PO BOX 11412, SANTA BARBARA, CA 93107-1412
PO BOX 11413, SANTA BARBARA, CA 93107-1413
PO BOX 11414, SANTA BARBARA, CA 93107-1414
PO BOX 11415, SANTA BARBARA, CA 93107-1415
PO BOX 11416, SANTA BARBARA, CA 93107-1416
PO BOX 11417, SANTA BARBARA, CA 93107-1417
PO BOX 11418, SANTA BARBARA, CA 93107-1418
PO BOX 11419, SANTA BARBARA, CA 93107-1419
PO BOX 11420, SANTA BARBARA, CA 93107-1420
PO BOX 11421, SANTA BARBARA, CA 93107-1421
PO BOX 11422, SANTA BARBARA, CA 93107-1422
PO BOX 11423, SANTA BARBARA, CA 93107-1423
PO BOX 11424, SANTA BARBARA, CA 93107-1424
PO BOX 11425, SANTA BARBARA, CA 93107-1425
PO BOX 11426, SANTA BARBARA, CA 93107-1426
PO BOX 11427, SANTA BARBARA, CA 93107-1427
PO BOX 11428, SANTA BARBARA, CA 93107-1428
PO BOX 11429, SANTA BARBARA, CA 93107-1429
PO BOX 11430, SANTA BARBARA, CA 93107-1430
PO BOX 11431, SANTA BARBARA, CA 93107-1431
PO BOX 11432, SANTA BARBARA, CA 93107-1432
PO BOX 11433, SANTA BARBARA, CA 93107-1433
PO BOX 11434, SANTA BARBARA, CA 93107-1434
PO BOX 11435, SANTA BARBARA, CA 93107-1435
PO BOX 11436, SANTA BARBARA, CA 93107-1436
PO BOX 11437, SANTA BARBARA, CA 93107-1437
PO BOX 11438, SANTA BARBARA, CA 93107-1438
PO BOX 11439, SANTA BARBARA, CA 93107-1439
PO BOX 11440, SANTA BARBARA, CA 93107-1440
PO BOX 11441, SANTA BARBARA, CA 93107-1441
PO BOX 11442, SANTA BARBARA, CA 93107-1442
PO BOX 11443, SANTA BARBARA, CA 93107-1443
PO BOX 11444, SANTA BARBARA, CA 93107-1444
PO BOX 11445, SANTA BARBARA, CA 93107-1445
PO BOX 11446, SANTA BARBARA, CA 93107-1446
PO BOX 11447, SANTA BARBARA, CA 93107-1447
PO BOX 11448, SANTA BARBARA, CA 93107-1448
PO BOX 11449, SANTA BARBARA, CA 93107-1449
PO BOX 11450, SANTA BARBARA, CA 93107-1450
PO BOX 11451, SANTA BARBARA, CA 93107-1451
PO BOX 11452, SANTA BARBARA, CA 93107-1452
PO BOX 11453, SANTA BARBARA, CA 93107-1453
PO BOX 11454, SANTA BARBARA, CA 93107-1454
PO BOX 11455, SANTA BARBARA, CA 93107-1455
PO BOX 11456, SANTA BARBARA, CA 93107-1456
PO BOX 11457, SANTA BARBARA, CA 93107-1457
PO BOX 11458, SANTA BARBARA, CA 93107-1458
PO BOX 11459, SANTA BARBARA, CA 93107-1459
PO BOX 11460, SANTA BARBARA, CA 93107-1460
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