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 201, WATERBURY, CT 06720-0201
PO BOX 202, WATERBURY, CT 06720-0202
PO BOX 203, WATERBURY, CT 06720-0203
PO BOX 204, WATERBURY, CT 06720-0204
PO BOX 205, WATERBURY, CT 06720-0205
PO BOX 206, WATERBURY, CT 06720-0206
PO BOX 207, WATERBURY, CT 06720-0207
PO BOX 208, WATERBURY, CT 06720-0208
PO BOX 209, WATERBURY, CT 06720-0209
PO BOX 210, WATERBURY, CT 06720-0210
PO BOX 211, WATERBURY, CT 06720-0211
PO BOX 212, WATERBURY, CT 06720-0212
PO BOX 213, WATERBURY, CT 06720-0213
PO BOX 214, WATERBURY, CT 06720-0214
PO BOX 215, WATERBURY, CT 06720-0215
PO BOX 216, WATERBURY, CT 06720-0216
PO BOX 217, WATERBURY, CT 06720-0217
PO BOX 218, WATERBURY, CT 06720-0218
PO BOX 219, WATERBURY, CT 06720-0219
PO BOX 220, WATERBURY, CT 06720-0220
PO BOX 221, WATERBURY, CT 06720-0221
PO BOX 222, WATERBURY, CT 06720-0222
PO BOX 223, WATERBURY, CT 06720-0223
PO BOX 224, WATERBURY, CT 06720-0224
PO BOX 225, WATERBURY, CT 06720-0225
PO BOX 226, WATERBURY, CT 06720-0226
PO BOX 227, WATERBURY, CT 06720-0227
PO BOX 228, WATERBURY, CT 06720-0228
PO BOX 229, WATERBURY, CT 06720-0229
PO BOX 230, WATERBURY, CT 06720-0230
PO BOX 231, WATERBURY, CT 06720-0231
PO BOX 232, WATERBURY, CT 06720-0232
PO BOX 233, WATERBURY, CT 06720-0233
PO BOX 234, WATERBURY, CT 06720-0234
PO BOX 235, WATERBURY, CT 06720-0235
PO BOX 236, WATERBURY, CT 06720-0236
PO BOX 237, WATERBURY, CT 06720-0237
PO BOX 238, WATERBURY, CT 06720-0238
PO BOX 239, WATERBURY, CT 06720-0239
PO BOX 240, WATERBURY, CT 06720-0240
PO BOX 241, WATERBURY, CT 06720-0241
PO BOX 242, WATERBURY, CT 06720-0242
PO BOX 243, WATERBURY, CT 06720-0243
PO BOX 244, WATERBURY, CT 06720-0244
PO BOX 245, WATERBURY, CT 06720-0245
PO BOX 246, WATERBURY, CT 06720-0246
PO BOX 247, WATERBURY, CT 06720-0247
PO BOX 248, WATERBURY, CT 06720-0248
PO BOX 249, WATERBURY, CT 06720-0249
PO BOX 250, WATERBURY, CT 06720-0250
PO BOX 251, WATERBURY, CT 06720-0251
PO BOX 252, WATERBURY, CT 06720-0252
PO BOX 253, WATERBURY, CT 06720-0253
PO BOX 254, WATERBURY, CT 06720-0254
PO BOX 255, WATERBURY, CT 06720-0255
PO BOX 256, WATERBURY, CT 06720-0256
PO BOX 257, WATERBURY, CT 06720-0257
PO BOX 258, WATERBURY, CT 06720-0258
PO BOX 259, WATERBURY, CT 06720-0259
PO BOX 260, WATERBURY, CT 06720-0260
PO BOX 261, WATERBURY, CT 06720-0261
PO BOX 262, WATERBURY, CT 06720-0262
PO BOX 263, WATERBURY, CT 06720-0263
PO BOX 264, WATERBURY, CT 06720-0264
PO BOX 265, WATERBURY, CT 06720-0265
PO BOX 266, WATERBURY, CT 06720-0266
PO BOX 267, WATERBURY, CT 06720-0267
PO BOX 268, WATERBURY, CT 06720-0268
PO BOX 269, WATERBURY, CT 06720-0269
PO BOX 270, WATERBURY, CT 06720-0270
PO BOX 271, WATERBURY, CT 06720-0271
PO BOX 272, WATERBURY, CT 06720-0272
PO BOX 273, WATERBURY, CT 06720-0273
PO BOX 274, WATERBURY, CT 06720-0274
PO BOX 275, WATERBURY, CT 06720-0275
PO BOX 276, WATERBURY, CT 06720-0276
PO BOX 277, WATERBURY, CT 06720-0277
PO BOX 278, WATERBURY, CT 06720-0278
PO BOX 279, WATERBURY, CT 06720-0279
PO BOX 280, WATERBURY, CT 06720-0280
PO BOX 281, WATERBURY, CT 06720-0281
PO BOX 282, WATERBURY, CT 06720-0282
PO BOX 283, WATERBURY, CT 06720-0283
PO BOX 284, WATERBURY, CT 06720-0284
PO BOX 285, WATERBURY, CT 06720-0285
PO BOX 286, WATERBURY, CT 06720-0286
PO BOX 287, WATERBURY, CT 06720-0287
PO BOX 288, WATERBURY, CT 06720-0288
PO BOX 289, WATERBURY, CT 06720-0289
PO BOX 290, WATERBURY, CT 06720-0290
PO BOX 291, WATERBURY, CT 06720-0291
PO BOX 292, WATERBURY, CT 06720-0292
PO BOX 293, WATERBURY, CT 06720-0293
PO BOX 294, WATERBURY, CT 06720-0294
PO BOX 295, WATERBURY, CT 06720-0295
PO BOX 296, WATERBURY, CT 06720-0296
PO BOX 297, WATERBURY, CT 06720-0297
PO BOX 298, WATERBURY, CT 06720-0298
PO BOX 299, WATERBURY, CT 06720-0299
PO BOX 300, WATERBURY, CT 06720-0300
PO BOX 301, WATERBURY, CT 06720-0301
PO BOX 302, WATERBURY, CT 06720-0302
PO BOX 303, WATERBURY, CT 06720-0303
PO BOX 304, WATERBURY, CT 06720-0304
PO BOX 305, WATERBURY, CT 06720-0305
PO BOX 306, WATERBURY, CT 06720-0306
PO BOX 307, WATERBURY, CT 06720-0307
PO BOX 308, WATERBURY, CT 06720-0308
PO BOX 309, WATERBURY, CT 06720-0309
PO BOX 310, WATERBURY, CT 06720-0310
PO BOX 311, WATERBURY, CT 06720-0311
PO BOX 312, WATERBURY, CT 06720-0312
PO BOX 313, WATERBURY, CT 06720-0313
PO BOX 314, WATERBURY, CT 06720-0314
PO BOX 315, WATERBURY, CT 06720-0315
PO BOX 316, WATERBURY, CT 06720-0316
PO BOX 317, WATERBURY, CT 06720-0317
PO BOX 318, WATERBURY, CT 06720-0318
PO BOX 319, WATERBURY, CT 06720-0319
PO BOX 320, WATERBURY, CT 06720-0320
PO BOX 321, WATERBURY, CT 06720-0321
PO BOX 322, WATERBURY, CT 06720-0322
PO BOX 323, WATERBURY, CT 06720-0323
PO BOX 324, WATERBURY, CT 06720-0324
PO BOX 325, WATERBURY, CT 06720-0325
PO BOX 326, WATERBURY, CT 06720-0326
PO BOX 327, WATERBURY, CT 06720-0327
PO BOX 328, WATERBURY, CT 06720-0328
PO BOX 329, WATERBURY, CT 06720-0329
PO BOX 330, WATERBURY, CT 06720-0330
PO BOX 331, WATERBURY, CT 06720-0331
PO BOX 332, WATERBURY, CT 06720-0332
PO BOX 333, WATERBURY, CT 06720-0333
PO BOX 334, WATERBURY, CT 06720-0334
PO BOX 335, WATERBURY, CT 06720-0335
PO BOX 336, WATERBURY, CT 06720-0336
PO BOX 337, WATERBURY, CT 06720-0337
PO BOX 338, WATERBURY, CT 06720-0338
PO BOX 339, WATERBURY, CT 06720-0339
PO BOX 340, WATERBURY, CT 06720-0340
PO BOX 341, WATERBURY, CT 06720-0341
PO BOX 342, WATERBURY, CT 06720-0342
PO BOX 343, WATERBURY, CT 06720-0343
PO BOX 344, WATERBURY, CT 06720-0344
PO BOX 345, WATERBURY, CT 06720-0345
PO BOX 346, WATERBURY, CT 06720-0346
PO BOX 347, WATERBURY, CT 06720-0347
PO BOX 348, WATERBURY, CT 06720-0348
PO BOX 349, WATERBURY, CT 06720-0349
PO BOX 350, WATERBURY, CT 06720-0350
PO BOX 351, WATERBURY, CT 06720-0351
PO BOX 352, WATERBURY, CT 06720-0352
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