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 1261, SAN MARCOS, CA 92079-1261
PO BOX 1262, SAN MARCOS, CA 92079-1262
PO BOX 1263, SAN MARCOS, CA 92079-1263
PO BOX 1264, SAN MARCOS, CA 92079-1264
PO BOX 1265, SAN MARCOS, CA 92079-1265
PO BOX 1266, SAN MARCOS, CA 92079-1266
PO BOX 1267, SAN MARCOS, CA 92079-1267
PO BOX 1268, SAN MARCOS, CA 92079-1268
PO BOX 1269, SAN MARCOS, CA 92079-1269
PO BOX 1270, SAN MARCOS, CA 92079-1270
PO BOX 1271, SAN MARCOS, CA 92079-1271
PO BOX 1272, SAN MARCOS, CA 92079-1272
PO BOX 1273, SAN MARCOS, CA 92079-1273
PO BOX 1274, SAN MARCOS, CA 92079-1274
PO BOX 1275, SAN MARCOS, CA 92079-1275
PO BOX 1276, SAN MARCOS, CA 92079-1276
PO BOX 1277, SAN MARCOS, CA 92079-1277
PO BOX 1278, SAN MARCOS, CA 92079-1278
PO BOX 1279, SAN MARCOS, CA 92079-1279
PO BOX 1280, SAN MARCOS, CA 92079-1280
PO BOX 1281, SAN MARCOS, CA 92079-1281
PO BOX 1282, SAN MARCOS, CA 92079-1282
PO BOX 1283, SAN MARCOS, CA 92079-1283
PO BOX 1284, SAN MARCOS, CA 92079-1284
PO BOX 1285, SAN MARCOS, CA 92079-1285
PO BOX 1286, SAN MARCOS, CA 92079-1286
PO BOX 1287, SAN MARCOS, CA 92079-1287
PO BOX 1288, SAN MARCOS, CA 92079-1288
PO BOX 1289, SAN MARCOS, CA 92079-1289
PO BOX 1290, SAN MARCOS, CA 92079-1290
PO BOX 1291, SAN MARCOS, CA 92079-1291
PO BOX 1292, SAN MARCOS, CA 92079-1292
PO BOX 1293, SAN MARCOS, CA 92079-1293
PO BOX 1294, SAN MARCOS, CA 92079-1294
PO BOX 1295, SAN MARCOS, CA 92079-1295
PO BOX 1296, SAN MARCOS, CA 92079-1296
PO BOX 1297, SAN MARCOS, CA 92079-1297
PO BOX 1298, SAN MARCOS, CA 92079-1298
PO BOX 1299, SAN MARCOS, CA 92079-1299
PO BOX 1300, SAN MARCOS, CA 92079-1300
PO BOX 1301, SAN MARCOS, CA 92079-1301
PO BOX 1302, SAN MARCOS, CA 92079-1302
PO BOX 1303, SAN MARCOS, CA 92079-1303
PO BOX 1304, SAN MARCOS, CA 92079-1304
PO BOX 1305, SAN MARCOS, CA 92079-1305
PO BOX 1306, SAN MARCOS, CA 92079-1306
PO BOX 1307, SAN MARCOS, CA 92079-1307
PO BOX 1308, SAN MARCOS, CA 92079-1308
PO BOX 1309, SAN MARCOS, CA 92079-1309
PO BOX 1310, SAN MARCOS, CA 92079-1310
PO BOX 1311, SAN MARCOS, CA 92079-1311
PO BOX 1312, SAN MARCOS, CA 92079-1312
PO BOX 1313, SAN MARCOS, CA 92079-1313
PO BOX 1314, SAN MARCOS, CA 92079-1314
PO BOX 1315, SAN MARCOS, CA 92079-1315
PO BOX 1316, SAN MARCOS, CA 92079-1316
PO BOX 1317, SAN MARCOS, CA 92079-1317
PO BOX 1318, SAN MARCOS, CA 92079-1318
PO BOX 1319, SAN MARCOS, CA 92079-1319
PO BOX 1320, SAN MARCOS, CA 92079-1320
PO BOX 1321, SAN MARCOS, CA 92079-1321
PO BOX 1322, SAN MARCOS, CA 92079-1322
PO BOX 1323, SAN MARCOS, CA 92079-1323
PO BOX 1324, SAN MARCOS, CA 92079-1324
PO BOX 1325, SAN MARCOS, CA 92079-1325
PO BOX 1326, SAN MARCOS, CA 92079-1326
PO BOX 1327, SAN MARCOS, CA 92079-1327
PO BOX 1328, SAN MARCOS, CA 92079-1328
PO BOX 1329, SAN MARCOS, CA 92079-1329
PO BOX 1330, SAN MARCOS, CA 92079-1330
PO BOX 1331, SAN MARCOS, CA 92079-1331
PO BOX 1332, SAN MARCOS, CA 92079-1332
PO BOX 1333, SAN MARCOS, CA 92079-1333
PO BOX 1334, SAN MARCOS, CA 92079-1334
PO BOX 1335, SAN MARCOS, CA 92079-1335
PO BOX 1336, SAN MARCOS, CA 92079-1336
PO BOX 1337, SAN MARCOS, CA 92079-1337
PO BOX 1338, SAN MARCOS, CA 92079-1338
PO BOX 1339, SAN MARCOS, CA 92079-1339
PO BOX 1340, SAN MARCOS, CA 92079-1340
PO BOX 1341, SAN MARCOS, CA 92079-1341
PO BOX 1342, SAN MARCOS, CA 92079-1342
PO BOX 1343, SAN MARCOS, CA 92079-1343
PO BOX 1344, SAN MARCOS, CA 92079-1344
PO BOX 1345, SAN MARCOS, CA 92079-1345
PO BOX 1346, SAN MARCOS, CA 92079-1346
PO BOX 1347, SAN MARCOS, CA 92079-1347
PO BOX 1348, SAN MARCOS, CA 92079-1348
PO BOX 1349, SAN MARCOS, CA 92079-1349
PO BOX 1350, SAN MARCOS, CA 92079-1350
PO BOX 1351, SAN MARCOS, CA 92079-1351
PO BOX 1352, SAN MARCOS, CA 92079-1352
PO BOX 1353, SAN MARCOS, CA 92079-1353
PO BOX 1354, SAN MARCOS, CA 92079-1354
PO BOX 1355, SAN MARCOS, CA 92079-1355
PO BOX 1356, SAN MARCOS, CA 92079-1356
PO BOX 1357, SAN MARCOS, CA 92079-1357
PO BOX 1358, SAN MARCOS, CA 92079-1358
PO BOX 1359, SAN MARCOS, CA 92079-1359
PO BOX 1360, SAN MARCOS, CA 92079-1360
PO BOX 1361, SAN MARCOS, CA 92079-1361
PO BOX 1362, SAN MARCOS, CA 92079-1362
PO BOX 1363, SAN MARCOS, CA 92079-1363
PO BOX 1364, SAN MARCOS, CA 92079-1364
PO BOX 1365, SAN MARCOS, CA 92079-1365
PO BOX 1366, SAN MARCOS, CA 92079-1366
PO BOX 1367, SAN MARCOS, CA 92079-1367
PO BOX 1368, SAN MARCOS, CA 92079-1368
PO BOX 1369, SAN MARCOS, CA 92079-1369
PO BOX 1370, SAN MARCOS, CA 92079-1370
PO BOX 1371, SAN MARCOS, CA 92079-1371
PO BOX 1372, SAN MARCOS, CA 92079-1372
PO BOX 1373, SAN MARCOS, CA 92079-1373
PO BOX 1374, SAN MARCOS, CA 92079-1374
PO BOX 1375, SAN MARCOS, CA 92079-1375
PO BOX 1376, SAN MARCOS, CA 92079-1376
PO BOX 1377, SAN MARCOS, CA 92079-1377
PO BOX 1378, SAN MARCOS, CA 92079-1378
PO BOX 1379, SAN MARCOS, CA 92079-1379
PO BOX 1380, SAN MARCOS, CA 92079-1380
PO BOX 1381, SAN MARCOS, CA 92079-1381
PO BOX 1382, SAN MARCOS, CA 92079-1382
PO BOX 1383, SAN MARCOS, CA 92079-1383
PO BOX 1384, SAN MARCOS, CA 92079-1384
PO BOX 1385, SAN MARCOS, CA 92079-1385
PO BOX 1386, SAN MARCOS, CA 92079-1386
PO BOX 1387, SAN MARCOS, CA 92079-1387
PO BOX 1388, SAN MARCOS, CA 92079-1388
PO BOX 1389, SAN MARCOS, CA 92079-1389
PO BOX 1390, SAN MARCOS, CA 92079-1390
PO BOX 1391, SAN MARCOS, CA 92079-1391
PO BOX 1392, SAN MARCOS, CA 92079-1392
PO BOX 1393, SAN MARCOS, CA 92079-1393
PO BOX 1394, SAN MARCOS, CA 92079-1394
PO BOX 1395, SAN MARCOS, CA 92079-1395
PO BOX 1396, SAN MARCOS, CA 92079-1396
PO BOX 1397, SAN MARCOS, CA 92079-1397
PO BOX 1398, SAN MARCOS, CA 92079-1398
PO BOX 1399, SAN MARCOS, CA 92079-1399
PO BOX 1400, SAN MARCOS, CA 92079-1400
PO BOX 1401, SAN MARCOS, CA 92079-1401
PO BOX 1402, SAN MARCOS, CA 92079-1402
PO BOX 1403, SAN MARCOS, CA 92079-1403
PO BOX 1404, SAN MARCOS, CA 92079-1404
PO BOX 1405, SAN MARCOS, CA 92079-1405
PO BOX 1406, SAN MARCOS, CA 92079-1406
PO BOX 1407, SAN MARCOS, CA 92079-1407
PO BOX 1408, SAN MARCOS, CA 92079-1408
PO BOX 1409, SAN MARCOS, CA 92079-1409
PO BOX 1410, SAN MARCOS, CA 92079-1410
PO BOX 1411, SAN MARCOS, CA 92079-1411
PO BOX 1412, SAN MARCOS, CA 92079-1412
PO BOX 1413, SAN MARCOS, CA 92079-1413
PO BOX 1414, SAN MARCOS, CA 92079-1414
PO BOX 1415, SAN MARCOS, CA 92079-1415
PO BOX 1416, SAN MARCOS, CA 92079-1416
PO BOX 1417, SAN MARCOS, CA 92079-1417
PO BOX 1418, SAN MARCOS, CA 92079-1418
PO BOX 1419, SAN MARCOS, CA 92079-1419
PO BOX 1420, SAN MARCOS, CA 92079-1420
PO BOX 1421, SAN MARCOS, CA 92079-1421
PO BOX 1422, SAN MARCOS, CA 92079-1422
PO BOX 1423, SAN MARCOS, CA 92079-1423
PO BOX 1424, SAN MARCOS, CA 92079-1424
PO BOX 1425, SAN MARCOS, CA 92079-1425
PO BOX 1426, SAN MARCOS, CA 92079-1426
PO BOX 1427, SAN MARCOS, CA 92079-1427
PO BOX 1428, SAN MARCOS, CA 92079-1428
PO BOX 1429, SAN MARCOS, CA 92079-1429
PO BOX 1430, SAN MARCOS, CA 92079-1430
PO BOX 1431, SAN MARCOS, CA 92079-1431
PO BOX 1432, SAN MARCOS, CA 92079-1432
PO BOX 1433, SAN MARCOS, CA 92079-1433
PO BOX 1434, SAN MARCOS, CA 92079-1434
PO BOX 1435, SAN MARCOS, CA 92079-1435
PO BOX 1436, SAN MARCOS, CA 92079-1436
PO BOX 1437, SAN MARCOS, CA 92079-1437
PO BOX 1438, SAN MARCOS, CA 92079-1438
PO BOX 1439, SAN MARCOS, CA 92079-1439
PO BOX 1440, SAN MARCOS, CA 92079-1440
PO BOX 1441, SAN MARCOS, CA 92079-1441
PO BOX 1442, SAN MARCOS, CA 92079-1442
PO BOX 1443, SAN MARCOS, CA 92079-1443
PO BOX 1444, SAN MARCOS, CA 92079-1444
PO BOX 1445, SAN MARCOS, CA 92079-1445
PO BOX 1446, SAN MARCOS, CA 92079-1446
PO BOX 1447, SAN MARCOS, CA 92079-1447
PO BOX 1448, SAN MARCOS, CA 92079-1448
PO BOX 1449, SAN MARCOS, CA 92079-1449
PO BOX 1450, SAN MARCOS, CA 92079-1450
PO BOX 1451, SAN MARCOS, CA 92079-1451
PO BOX 1452, SAN MARCOS, CA 92079-1452
PO BOX 1453, SAN MARCOS, CA 92079-1453
PO BOX 1454, SAN MARCOS, CA 92079-1454
PO BOX 1455, SAN MARCOS, CA 92079-1455
PO BOX 1456, SAN MARCOS, CA 92079-1456
PO BOX 1457, SAN MARCOS, CA 92079-1457
PO BOX 1458, SAN MARCOS, CA 92079-1458
PO BOX 1459, SAN MARCOS, CA 92079-1459
PO BOX 1460, SAN MARCOS, CA 92079-1460
PO BOX 1461, SAN MARCOS, CA 92079-1461
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