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 1201, SALISBURY, MD 21802-1201
PO BOX 1202, SALISBURY, MD 21802-1202
PO BOX 1203, SALISBURY, MD 21802-1203
PO BOX 1204, SALISBURY, MD 21802-1204
PO BOX 1205, SALISBURY, MD 21802-1205
PO BOX 1206, SALISBURY, MD 21802-1206
PO BOX 1207, SALISBURY, MD 21802-1207
PO BOX 1208, SALISBURY, MD 21802-1208
PO BOX 1209, SALISBURY, MD 21802-1209
PO BOX 1210, SALISBURY, MD 21802-1210
PO BOX 1211, SALISBURY, MD 21802-1211
PO BOX 1212, SALISBURY, MD 21802-1212
PO BOX 1213, SALISBURY, MD 21802-1213
PO BOX 1214, SALISBURY, MD 21802-1214
PO BOX 1215, SALISBURY, MD 21802-1215
PO BOX 1216, SALISBURY, MD 21802-1216
PO BOX 1217, SALISBURY, MD 21802-1217
PO BOX 1218, SALISBURY, MD 21802-1218
PO BOX 1219, SALISBURY, MD 21802-1219
PO BOX 1220, SALISBURY, MD 21802-1220
PO BOX 1221, SALISBURY, MD 21802-1221
PO BOX 1222, SALISBURY, MD 21802-1222
PO BOX 1223, SALISBURY, MD 21802-1223
PO BOX 1224, SALISBURY, MD 21802-1224
PO BOX 1225, SALISBURY, MD 21802-1225
PO BOX 1226, SALISBURY, MD 21802-1226
PO BOX 1227, SALISBURY, MD 21802-1227
PO BOX 1228, SALISBURY, MD 21802-1228
PO BOX 1229, SALISBURY, MD 21802-1229
PO BOX 1230, SALISBURY, MD 21802-1230
PO BOX 1231, SALISBURY, MD 21802-1231
PO BOX 1232, SALISBURY, MD 21802-1232
PO BOX 1233, SALISBURY, MD 21802-1233
PO BOX 1234, SALISBURY, MD 21802-1234
PO BOX 1235, SALISBURY, MD 21802-1235
PO BOX 1236, SALISBURY, MD 21802-1236
PO BOX 1237, SALISBURY, MD 21802-1237
PO BOX 1238, SALISBURY, MD 21802-1238
PO BOX 1239, SALISBURY, MD 21802-1239
PO BOX 1240, SALISBURY, MD 21802-1240
PO BOX 1241, SALISBURY, MD 21802-1241
PO BOX 1242, SALISBURY, MD 21802-1242
PO BOX 1243, SALISBURY, MD 21802-1243
PO BOX 1244, SALISBURY, MD 21802-1244
PO BOX 1245, SALISBURY, MD 21802-1245
PO BOX 1246, SALISBURY, MD 21802-1246
PO BOX 1247, SALISBURY, MD 21802-1247
PO BOX 1248, SALISBURY, MD 21802-1248
PO BOX 1249, SALISBURY, MD 21802-1249
PO BOX 1250, SALISBURY, MD 21802-1250
PO BOX 1251, SALISBURY, MD 21802-1251
PO BOX 1252, SALISBURY, MD 21802-1252
PO BOX 1253, SALISBURY, MD 21802-1253
PO BOX 1254, SALISBURY, MD 21802-1254
PO BOX 1255, SALISBURY, MD 21802-1255
PO BOX 1256, SALISBURY, MD 21802-1256
PO BOX 1257, SALISBURY, MD 21802-1257
PO BOX 1258, SALISBURY, MD 21802-1258
PO BOX 1259, SALISBURY, MD 21802-1259
PO BOX 1260, SALISBURY, MD 21802-1260
PO BOX 1261, SALISBURY, MD 21802-1261
PO BOX 1262, SALISBURY, MD 21802-1262
PO BOX 1263, SALISBURY, MD 21802-1263
PO BOX 1264, SALISBURY, MD 21802-1264
PO BOX 1265, SALISBURY, MD 21802-1265
PO BOX 1266, SALISBURY, MD 21802-1266
PO BOX 1267, SALISBURY, MD 21802-1267
PO BOX 1268, SALISBURY, MD 21802-1268
PO BOX 1269, SALISBURY, MD 21802-1269
PO BOX 1270, SALISBURY, MD 21802-1270
PO BOX 1271, SALISBURY, MD 21802-1271
PO BOX 1272, SALISBURY, MD 21802-1272
PO BOX 1273, SALISBURY, MD 21802-1273
PO BOX 1274, SALISBURY, MD 21802-1274
PO BOX 1275, SALISBURY, MD 21802-1275
PO BOX 1276, SALISBURY, MD 21802-1276
PO BOX 1277, SALISBURY, MD 21802-1277
PO BOX 1278, SALISBURY, MD 21802-1278
PO BOX 1279, SALISBURY, MD 21802-1279
PO BOX 1280, SALISBURY, MD 21802-1280
PO BOX 1281, SALISBURY, MD 21802-1281
PO BOX 1282, SALISBURY, MD 21802-1282
PO BOX 1283, SALISBURY, MD 21802-1283
PO BOX 1284, SALISBURY, MD 21802-1284
PO BOX 1285, SALISBURY, MD 21802-1285
PO BOX 1286, SALISBURY, MD 21802-1286
PO BOX 1287, SALISBURY, MD 21802-1287
PO BOX 1288, SALISBURY, MD 21802-1288
PO BOX 1289, SALISBURY, MD 21802-1289
PO BOX 1290, SALISBURY, MD 21802-1290
PO BOX 1291, SALISBURY, MD 21802-1291
PO BOX 1292, SALISBURY, MD 21802-1292
PO BOX 1293, SALISBURY, MD 21802-1293
PO BOX 1294, SALISBURY, MD 21802-1294
PO BOX 1295, SALISBURY, MD 21802-1295
PO BOX 1296, SALISBURY, MD 21802-1296
PO BOX 1297, SALISBURY, MD 21802-1297
PO BOX 1298, SALISBURY, MD 21802-1298
PO BOX 1299, SALISBURY, MD 21802-1299
PO BOX 1300, SALISBURY, MD 21802-1300
PO BOX 1301, SALISBURY, MD 21802-1301
PO BOX 1302, SALISBURY, MD 21802-1302
PO BOX 1303, SALISBURY, MD 21802-1303
PO BOX 1304, SALISBURY, MD 21802-1304
PO BOX 1305, SALISBURY, MD 21802-1305
PO BOX 1306, SALISBURY, MD 21802-1306
PO BOX 1307, SALISBURY, MD 21802-1307
PO BOX 1308, SALISBURY, MD 21802-1308
PO BOX 1309, SALISBURY, MD 21802-1309
PO BOX 1310, SALISBURY, MD 21802-1310
PO BOX 1311, SALISBURY, MD 21802-1311
PO BOX 1312, SALISBURY, MD 21802-1312
PO BOX 1313, SALISBURY, MD 21802-1313
PO BOX 1314, SALISBURY, MD 21802-1314
PO BOX 1315, SALISBURY, MD 21802-1315
PO BOX 1316, SALISBURY, MD 21802-1316
PO BOX 1317, SALISBURY, MD 21802-1317
PO BOX 1318, SALISBURY, MD 21802-1318
PO BOX 1319, SALISBURY, MD 21802-1319
PO BOX 1320, SALISBURY, MD 21802-1320
PO BOX 1321, SALISBURY, MD 21802-1321
PO BOX 1322, SALISBURY, MD 21802-1322
PO BOX 1323, SALISBURY, MD 21802-1323
PO BOX 1324, SALISBURY, MD 21802-1324
PO BOX 1325, SALISBURY, MD 21802-1325
PO BOX 1326, SALISBURY, MD 21802-1326
PO BOX 1327, SALISBURY, MD 21802-1327
PO BOX 1328, SALISBURY, MD 21802-1328
PO BOX 1329, SALISBURY, MD 21802-1329
PO BOX 1330, SALISBURY, MD 21802-1330
PO BOX 1331, SALISBURY, MD 21802-1331
PO BOX 1332, SALISBURY, MD 21802-1332
PO BOX 1333, SALISBURY, MD 21802-1333
PO BOX 1334, SALISBURY, MD 21802-1334
PO BOX 1335, SALISBURY, MD 21802-1335
PO BOX 1336, SALISBURY, MD 21802-1336
PO BOX 1337, SALISBURY, MD 21802-1337
PO BOX 1338, SALISBURY, MD 21802-1338
PO BOX 1339, SALISBURY, MD 21802-1339
PO BOX 1340, SALISBURY, MD 21802-1340
PO BOX 1341, SALISBURY, MD 21802-1341
PO BOX 1342, SALISBURY, MD 21802-1342
PO BOX 1343, SALISBURY, MD 21802-1343
PO BOX 1344, SALISBURY, MD 21802-1344
PO BOX 1345, SALISBURY, MD 21802-1345
PO BOX 1346, SALISBURY, MD 21802-1346
PO BOX 1347, SALISBURY, MD 21802-1347
PO BOX 1348, SALISBURY, MD 21802-1348
PO BOX 1349, SALISBURY, MD 21802-1349
PO BOX 1350, SALISBURY, MD 21802-1350
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