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, WEST SPRINGFIELD, MA 01090-1261
PO BOX 1262, WEST SPRINGFIELD, MA 01090-1262
PO BOX 1263, WEST SPRINGFIELD, MA 01090-1263
PO BOX 1264, WEST SPRINGFIELD, MA 01090-1264
PO BOX 1265, WEST SPRINGFIELD, MA 01090-1265
PO BOX 1266, WEST SPRINGFIELD, MA 01090-1266
PO BOX 1267, WEST SPRINGFIELD, MA 01090-1267
PO BOX 1268, WEST SPRINGFIELD, MA 01090-1268
PO BOX 1269, WEST SPRINGFIELD, MA 01090-1269
PO BOX 1270, WEST SPRINGFIELD, MA 01090-1270
PO BOX 1271, WEST SPRINGFIELD, MA 01090-1271
PO BOX 1272, WEST SPRINGFIELD, MA 01090-1272
PO BOX 1273, WEST SPRINGFIELD, MA 01090-1273
PO BOX 1274, WEST SPRINGFIELD, MA 01090-1274
PO BOX 1275, WEST SPRINGFIELD, MA 01090-1275
PO BOX 1276, WEST SPRINGFIELD, MA 01090-1276
PO BOX 1277, WEST SPRINGFIELD, MA 01090-1277
PO BOX 1278, WEST SPRINGFIELD, MA 01090-1278
PO BOX 1279, WEST SPRINGFIELD, MA 01090-1279
PO BOX 1280, WEST SPRINGFIELD, MA 01090-1280
PO BOX 1281, WEST SPRINGFIELD, MA 01090-1281
PO BOX 1282, WEST SPRINGFIELD, MA 01090-1282
PO BOX 1283, WEST SPRINGFIELD, MA 01090-1283
PO BOX 1284, WEST SPRINGFIELD, MA 01090-1284
PO BOX 1285, WEST SPRINGFIELD, MA 01090-1285
PO BOX 1286, WEST SPRINGFIELD, MA 01090-1286
PO BOX 1287, WEST SPRINGFIELD, MA 01090-1287
PO BOX 1288, WEST SPRINGFIELD, MA 01090-1288
PO BOX 1289, WEST SPRINGFIELD, MA 01090-1289
PO BOX 1290, WEST SPRINGFIELD, MA 01090-1290
PO BOX 1291, WEST SPRINGFIELD, MA 01090-1291
PO BOX 1292, WEST SPRINGFIELD, MA 01090-1292
PO BOX 1293, WEST SPRINGFIELD, MA 01090-1293
PO BOX 1294, WEST SPRINGFIELD, MA 01090-1294
PO BOX 1295, WEST SPRINGFIELD, MA 01090-1295
PO BOX 1296, WEST SPRINGFIELD, MA 01090-1296
PO BOX 1297, WEST SPRINGFIELD, MA 01090-1297
PO BOX 1298, WEST SPRINGFIELD, MA 01090-1298
PO BOX 1299, WEST SPRINGFIELD, MA 01090-1299
PO BOX 1300, WEST SPRINGFIELD, MA 01090-1300
PO BOX 1301, WEST SPRINGFIELD, MA 01090-1301
PO BOX 1302, WEST SPRINGFIELD, MA 01090-1302
PO BOX 1303, WEST SPRINGFIELD, MA 01090-1303
PO BOX 1304, WEST SPRINGFIELD, MA 01090-1304
PO BOX 1305, WEST SPRINGFIELD, MA 01090-1305
PO BOX 1306, WEST SPRINGFIELD, MA 01090-1306
PO BOX 1307, WEST SPRINGFIELD, MA 01090-1307
PO BOX 1308, WEST SPRINGFIELD, MA 01090-1308
PO BOX 1309, WEST SPRINGFIELD, MA 01090-1309
PO BOX 1310, WEST SPRINGFIELD, MA 01090-1310
PO BOX 1311, WEST SPRINGFIELD, MA 01090-1311
PO BOX 1312, WEST SPRINGFIELD, MA 01090-1312
PO BOX 1313, WEST SPRINGFIELD, MA 01090-1313
PO BOX 1314, WEST SPRINGFIELD, MA 01090-1314
PO BOX 1315, WEST SPRINGFIELD, MA 01090-1315
PO BOX 1316, WEST SPRINGFIELD, MA 01090-1316
PO BOX 1317, WEST SPRINGFIELD, MA 01090-1317
PO BOX 1318, WEST SPRINGFIELD, MA 01090-1318
PO BOX 1319, WEST SPRINGFIELD, MA 01090-1319
PO BOX 1320, WEST SPRINGFIELD, MA 01090-1320
PO BOX 1321, WEST SPRINGFIELD, MA 01090-1321
PO BOX 1322, WEST SPRINGFIELD, MA 01090-1322
PO BOX 1323, WEST SPRINGFIELD, MA 01090-1323
PO BOX 1324, WEST SPRINGFIELD, MA 01090-1324
PO BOX 1325, WEST SPRINGFIELD, MA 01090-1325
PO BOX 1326, WEST SPRINGFIELD, MA 01090-1326
PO BOX 1327, WEST SPRINGFIELD, MA 01090-1327
PO BOX 1328, WEST SPRINGFIELD, MA 01090-1328
PO BOX 1329, WEST SPRINGFIELD, MA 01090-1329
PO BOX 1330, WEST SPRINGFIELD, MA 01090-1330
PO BOX 1331, WEST SPRINGFIELD, MA 01090-1331
PO BOX 1332, WEST SPRINGFIELD, MA 01090-1332
PO BOX 1333, WEST SPRINGFIELD, MA 01090-1333
PO BOX 1334, WEST SPRINGFIELD, MA 01090-1334
PO BOX 1335, WEST SPRINGFIELD, MA 01090-1335
PO BOX 1336, WEST SPRINGFIELD, MA 01090-1336
PO BOX 1337, WEST SPRINGFIELD, MA 01090-1337
PO BOX 1338, WEST SPRINGFIELD, MA 01090-1338
PO BOX 1339, WEST SPRINGFIELD, MA 01090-1339
PO BOX 1340, WEST SPRINGFIELD, MA 01090-1340
PO BOX 1341, WEST SPRINGFIELD, MA 01090-1341
PO BOX 1342, WEST SPRINGFIELD, MA 01090-1342
PO BOX 1343, WEST SPRINGFIELD, MA 01090-1343
PO BOX 1344, WEST SPRINGFIELD, MA 01090-1344
PO BOX 1345, WEST SPRINGFIELD, MA 01090-1345
PO BOX 1346, WEST SPRINGFIELD, MA 01090-1346
PO BOX 1347, WEST SPRINGFIELD, MA 01090-1347
PO BOX 1348, WEST SPRINGFIELD, MA 01090-1348
PO BOX 1349, WEST SPRINGFIELD, MA 01090-1349
PO BOX 1350, WEST SPRINGFIELD, MA 01090-1350
PO BOX 1351, WEST SPRINGFIELD, MA 01090-1351
PO BOX 1352, WEST SPRINGFIELD, MA 01090-1352
PO BOX 1353, WEST SPRINGFIELD, MA 01090-1353
PO BOX 1354, WEST SPRINGFIELD, MA 01090-1354
PO BOX 1355, WEST SPRINGFIELD, MA 01090-1355
PO BOX 1356, WEST SPRINGFIELD, MA 01090-1356
PO BOX 1357, WEST SPRINGFIELD, MA 01090-1357
PO BOX 1358, WEST SPRINGFIELD, MA 01090-1358
PO BOX 1359, WEST SPRINGFIELD, MA 01090-1359
PO BOX 1360, WEST SPRINGFIELD, MA 01090-1360
PO BOX 1361, WEST SPRINGFIELD, MA 01090-1361
PO BOX 1362, WEST SPRINGFIELD, MA 01090-1362
PO BOX 1363, WEST SPRINGFIELD, MA 01090-1363
PO BOX 1364, WEST SPRINGFIELD, MA 01090-1364
PO BOX 1365, WEST SPRINGFIELD, MA 01090-1365
PO BOX 1366, WEST SPRINGFIELD, MA 01090-1366
PO BOX 1367, WEST SPRINGFIELD, MA 01090-1367
PO BOX 1368, WEST SPRINGFIELD, MA 01090-1368
PO BOX 1369, WEST SPRINGFIELD, MA 01090-1369
PO BOX 1370, WEST SPRINGFIELD, MA 01090-1370
PO BOX 1371, WEST SPRINGFIELD, MA 01090-1371
PO BOX 1372, WEST SPRINGFIELD, MA 01090-1372
PO BOX 1373, WEST SPRINGFIELD, MA 01090-1373
PO BOX 1374, WEST SPRINGFIELD, MA 01090-1374
PO BOX 1375, WEST SPRINGFIELD, MA 01090-1375
PO BOX 1376, WEST SPRINGFIELD, MA 01090-1376
PO BOX 1377, WEST SPRINGFIELD, MA 01090-1377
PO BOX 1378, WEST SPRINGFIELD, MA 01090-1378
PO BOX 1379, WEST SPRINGFIELD, MA 01090-1379
PO BOX 1380, WEST SPRINGFIELD, MA 01090-1380
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