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 1301, SUN VALLEY, CA 91353-1301
PO BOX 1302, SUN VALLEY, CA 91353-1302
PO BOX 1303, SUN VALLEY, CA 91353-1303
PO BOX 1304, SUN VALLEY, CA 91353-1304
PO BOX 1305, SUN VALLEY, CA 91353-1305
PO BOX 1306, SUN VALLEY, CA 91353-1306
PO BOX 1307, SUN VALLEY, CA 91353-1307
PO BOX 1308, SUN VALLEY, CA 91353-1308
PO BOX 1309, SUN VALLEY, CA 91353-1309
PO BOX 1310, SUN VALLEY, CA 91353-1310
PO BOX 1311, SUN VALLEY, CA 91353-1311
PO BOX 1312, SUN VALLEY, CA 91353-1312
PO BOX 1313, SUN VALLEY, CA 91353-1313
PO BOX 1314, SUN VALLEY, CA 91353-1314
PO BOX 1315, SUN VALLEY, CA 91353-1315
PO BOX 1316, SUN VALLEY, CA 91353-1316
PO BOX 1317, SUN VALLEY, CA 91353-1317
PO BOX 1318, SUN VALLEY, CA 91353-1318
PO BOX 1319, SUN VALLEY, CA 91353-1319
PO BOX 1320, SUN VALLEY, CA 91353-1320
PO BOX 1321, SUN VALLEY, CA 91353-1321
PO BOX 1322, SUN VALLEY, CA 91353-1322
PO BOX 1323, SUN VALLEY, CA 91353-1323
PO BOX 1324, SUN VALLEY, CA 91353-1324
PO BOX 1325, SUN VALLEY, CA 91353-1325
PO BOX 1326, SUN VALLEY, CA 91353-1326
PO BOX 1327, SUN VALLEY, CA 91353-1327
PO BOX 1328, SUN VALLEY, CA 91353-1328
PO BOX 1329, SUN VALLEY, CA 91353-1329
PO BOX 1330, SUN VALLEY, CA 91353-1330
PO BOX 1331, SUN VALLEY, CA 91353-1331
PO BOX 1332, SUN VALLEY, CA 91353-1332
PO BOX 1333, SUN VALLEY, CA 91353-1333
PO BOX 1334, SUN VALLEY, CA 91353-1334
PO BOX 1335, SUN VALLEY, CA 91353-1335
PO BOX 1336, SUN VALLEY, CA 91353-1336
PO BOX 1337, SUN VALLEY, CA 91353-1337
PO BOX 1338, SUN VALLEY, CA 91353-1338
PO BOX 1339, SUN VALLEY, CA 91353-1339
PO BOX 1340, SUN VALLEY, CA 91353-1340
PO BOX 1341, SUN VALLEY, CA 91353-1341
PO BOX 1342, SUN VALLEY, CA 91353-1342
PO BOX 1343, SUN VALLEY, CA 91353-1343
PO BOX 1344, SUN VALLEY, CA 91353-1344
PO BOX 1345, SUN VALLEY, CA 91353-1345
PO BOX 1346, SUN VALLEY, CA 91353-1346
PO BOX 1347, SUN VALLEY, CA 91353-1347
PO BOX 1348, SUN VALLEY, CA 91353-1348
PO BOX 1349, SUN VALLEY, CA 91353-1349
PO BOX 1350, SUN VALLEY, CA 91353-1350
PO BOX 1351, SUN VALLEY, CA 91353-1351
PO BOX 1352, SUN VALLEY, CA 91353-1352
PO BOX 1353, SUN VALLEY, CA 91353-1353
PO BOX 1354, SUN VALLEY, CA 91353-1354
PO BOX 1355, SUN VALLEY, CA 91353-1355
PO BOX 1356, SUN VALLEY, CA 91353-1356
PO BOX 1357, SUN VALLEY, CA 91353-1357
PO BOX 1358, SUN VALLEY, CA 91353-1358
PO BOX 1359, SUN VALLEY, CA 91353-1359
PO BOX 1360, SUN VALLEY, CA 91353-1360
PO BOX 1361, SUN VALLEY, CA 91353-1361
PO BOX 1362, SUN VALLEY, CA 91353-1362
PO BOX 1363, SUN VALLEY, CA 91353-1363
PO BOX 1364, SUN VALLEY, CA 91353-1364
PO BOX 1365, SUN VALLEY, CA 91353-1365
PO BOX 1366, SUN VALLEY, CA 91353-1366
PO BOX 1367, SUN VALLEY, CA 91353-1367
PO BOX 1368, SUN VALLEY, CA 91353-1368
PO BOX 1369, SUN VALLEY, CA 91353-1369
PO BOX 1370, SUN VALLEY, CA 91353-1370
PO BOX 1371, SUN VALLEY, CA 91353-1371
PO BOX 1372, SUN VALLEY, CA 91353-1372
PO BOX 1373, SUN VALLEY, CA 91353-1373
PO BOX 1374, SUN VALLEY, CA 91353-1374
PO BOX 1375, SUN VALLEY, CA 91353-1375
PO BOX 1376, SUN VALLEY, CA 91353-1376
PO BOX 1377, SUN VALLEY, CA 91353-1377
PO BOX 1378, SUN VALLEY, CA 91353-1378
PO BOX 1379, SUN VALLEY, CA 91353-1379
PO BOX 1380, SUN VALLEY, CA 91353-1380
PO BOX 1381, SUN VALLEY, CA 91353-1381
PO BOX 1382, SUN VALLEY, CA 91353-1382
PO BOX 1383, SUN VALLEY, CA 91353-1383
PO BOX 1384, SUN VALLEY, CA 91353-1384
PO BOX 1385, SUN VALLEY, CA 91353-1385
PO BOX 1386, SUN VALLEY, CA 91353-1386
PO BOX 1387, SUN VALLEY, CA 91353-1387
PO BOX 1388, SUN VALLEY, CA 91353-1388
PO BOX 1389, SUN VALLEY, CA 91353-1389
PO BOX 1390, SUN VALLEY, CA 91353-1390
PO BOX 1391, SUN VALLEY, CA 91353-1391
PO BOX 1392, SUN VALLEY, CA 91353-1392
PO BOX 1393, SUN VALLEY, CA 91353-1393
PO BOX 1394, SUN VALLEY, CA 91353-1394
PO BOX 1395, SUN VALLEY, CA 91353-1395
PO BOX 1396, SUN VALLEY, CA 91353-1396
PO BOX 1397, SUN VALLEY, CA 91353-1397
PO BOX 1398, SUN VALLEY, CA 91353-1398
PO BOX 1399, SUN VALLEY, CA 91353-1399
PO BOX 1400, SUN VALLEY, CA 91353-1400
PO BOX 1401, SUN VALLEY, CA 91353-1401
PO BOX 1402, SUN VALLEY, CA 91353-1402
PO BOX 1403, SUN VALLEY, CA 91353-1403
PO BOX 1404, SUN VALLEY, CA 91353-1404
PO BOX 1405, SUN VALLEY, CA 91353-1405
PO BOX 1406, SUN VALLEY, CA 91353-1406
PO BOX 1407, SUN VALLEY, CA 91353-1407
PO BOX 1408, SUN VALLEY, CA 91353-1408
PO BOX 1409, SUN VALLEY, CA 91353-1409
PO BOX 1410, SUN VALLEY, CA 91353-1410
PO BOX 1411, SUN VALLEY, CA 91353-1411
PO BOX 1412, SUN VALLEY, CA 91353-1412
PO BOX 1413, SUN VALLEY, CA 91353-1413
PO BOX 1414, SUN VALLEY, CA 91353-1414
PO BOX 1415, SUN VALLEY, CA 91353-1415
PO BOX 1416, SUN VALLEY, CA 91353-1416
PO BOX 1417, SUN VALLEY, CA 91353-1417
PO BOX 1418, SUN VALLEY, CA 91353-1418
PO BOX 1419, SUN VALLEY, CA 91353-1419
PO BOX 1420, SUN VALLEY, CA 91353-1420
PO BOX 1421, SUN VALLEY, CA 91353-1421
PO BOX 1422, SUN VALLEY, CA 91353-1422
PO BOX 1423, SUN VALLEY, CA 91353-1423
PO BOX 1424, SUN VALLEY, CA 91353-1424
PO BOX 1425, SUN VALLEY, CA 91353-1425
PO BOX 1426, SUN VALLEY, CA 91353-1426
PO BOX 1427, SUN VALLEY, CA 91353-1427
PO BOX 1428, SUN VALLEY, CA 91353-1428
PO BOX 1429, SUN VALLEY, CA 91353-1429
PO BOX 1430, SUN VALLEY, CA 91353-1430
PO BOX 1431, SUN VALLEY, CA 91353-1431
PO BOX 1432, SUN VALLEY, CA 91353-1432
PO BOX 1433, SUN VALLEY, CA 91353-1433
PO BOX 1434, SUN VALLEY, CA 91353-1434
PO BOX 1435, SUN VALLEY, CA 91353-1435
PO BOX 1436, SUN VALLEY, CA 91353-1436
PO BOX 1437, SUN VALLEY, CA 91353-1437
PO BOX 1438, SUN VALLEY, CA 91353-1438
PO BOX 1439, SUN VALLEY, CA 91353-1439
PO BOX 1440, SUN VALLEY, CA 91353-1440
PO BOX 1441, SUN VALLEY, CA 91353-1441
PO BOX 1442, SUN VALLEY, CA 91353-1442
PO BOX 1443, SUN VALLEY, CA 91353-1443
PO BOX 1444, SUN VALLEY, CA 91353-1444
PO BOX 1445, SUN VALLEY, CA 91353-1445
PO BOX 1446, SUN VALLEY, CA 91353-1446
PO BOX 1447, SUN VALLEY, CA 91353-1447
PO BOX 1448, SUN VALLEY, CA 91353-1448
PO BOX 1449, SUN VALLEY, CA 91353-1449
PO BOX 1450, SUN VALLEY, CA 91353-1450
PO BOX 1451, SUN VALLEY, CA 91353-1451
PO BOX 1452, SUN VALLEY, CA 91353-1452
PO BOX 1453, SUN VALLEY, CA 91353-1453
PO BOX 1454, SUN VALLEY, CA 91353-1454
PO BOX 1455, SUN VALLEY, CA 91353-1455
PO BOX 1456, SUN VALLEY, CA 91353-1456
PO BOX 1457, SUN VALLEY, CA 91353-1457
PO BOX 1458, SUN VALLEY, CA 91353-1458
PO BOX 1459, SUN VALLEY, CA 91353-1459
PO BOX 1460, SUN VALLEY, CA 91353-1460
PO BOX 1461, SUN VALLEY, CA 91353-1461
PO BOX 1462, SUN VALLEY, CA 91353-1462
PO BOX 1463, SUN VALLEY, CA 91353-1463
PO BOX 1464, SUN VALLEY, CA 91353-1464
PO BOX 1465, SUN VALLEY, CA 91353-1465
PO BOX 1466, SUN VALLEY, CA 91353-1466
PO BOX 1467, SUN VALLEY, CA 91353-1467
PO BOX 1468, SUN VALLEY, CA 91353-1468
PO BOX 1469, SUN VALLEY, CA 91353-1469
PO BOX 1470, SUN VALLEY, CA 91353-1470
PO BOX 1471, SUN VALLEY, CA 91353-1471
PO BOX 1472, SUN VALLEY, CA 91353-1472
PO BOX 1473, SUN VALLEY, CA 91353-1473
PO BOX 1474, SUN VALLEY, CA 91353-1474
PO BOX 1475, SUN VALLEY, CA 91353-1475
PO BOX 1476, SUN VALLEY, CA 91353-1476
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