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 21, FORT FAIRFIELD, ME 04742-0021
PO BOX 22, FORT FAIRFIELD, ME 04742-0022
PO BOX 23, FORT FAIRFIELD, ME 04742-0023
PO BOX 24, FORT FAIRFIELD, ME 04742-0024
PO BOX 25, FORT FAIRFIELD, ME 04742-0025
PO BOX 26, FORT FAIRFIELD, ME 04742-0026
PO BOX 27, FORT FAIRFIELD, ME 04742-0027
PO BOX 28, FORT FAIRFIELD, ME 04742-0028
PO BOX 29, FORT FAIRFIELD, ME 04742-0029
PO BOX 30, FORT FAIRFIELD, ME 04742-0030
PO BOX 31, FORT FAIRFIELD, ME 04742-0031
PO BOX 32, FORT FAIRFIELD, ME 04742-0032
PO BOX 33, FORT FAIRFIELD, ME 04742-0033
PO BOX 34, FORT FAIRFIELD, ME 04742-0034
PO BOX 35, FORT FAIRFIELD, ME 04742-0035
PO BOX 36, FORT FAIRFIELD, ME 04742-0036
PO BOX 37, FORT FAIRFIELD, ME 04742-0037
PO BOX 38, FORT FAIRFIELD, ME 04742-0038
PO BOX 39, FORT FAIRFIELD, ME 04742-0039
PO BOX 40, FORT FAIRFIELD, ME 04742-0040
PO BOX 41, FORT FAIRFIELD, ME 04742-0041
PO BOX 42, FORT FAIRFIELD, ME 04742-0042
PO BOX 43, FORT FAIRFIELD, ME 04742-0043
PO BOX 44, FORT FAIRFIELD, ME 04742-0044
PO BOX 45, FORT FAIRFIELD, ME 04742-0045
PO BOX 46, FORT FAIRFIELD, ME 04742-0046
PO BOX 47, FORT FAIRFIELD, ME 04742-0047
PO BOX 48, FORT FAIRFIELD, ME 04742-0048
PO BOX 49, FORT FAIRFIELD, ME 04742-0049
PO BOX 50, FORT FAIRFIELD, ME 04742-0050
PO BOX 51, FORT FAIRFIELD, ME 04742-0051
PO BOX 52, FORT FAIRFIELD, ME 04742-0052
PO BOX 53, FORT FAIRFIELD, ME 04742-0053
PO BOX 54, FORT FAIRFIELD, ME 04742-0054
PO BOX 55, FORT FAIRFIELD, ME 04742-0055
PO BOX 56, FORT FAIRFIELD, ME 04742-0056
PO BOX 57, FORT FAIRFIELD, ME 04742-0057
PO BOX 58, FORT FAIRFIELD, ME 04742-0058
PO BOX 59, FORT FAIRFIELD, ME 04742-0059
PO BOX 60, FORT FAIRFIELD, ME 04742-0060
PO BOX 61, FORT FAIRFIELD, ME 04742-0061
PO BOX 62, FORT FAIRFIELD, ME 04742-0062
PO BOX 63, FORT FAIRFIELD, ME 04742-0063
PO BOX 64, FORT FAIRFIELD, ME 04742-0064
PO BOX 65, FORT FAIRFIELD, ME 04742-0065
PO BOX 66, FORT FAIRFIELD, ME 04742-0066
PO BOX 67, FORT FAIRFIELD, ME 04742-0067
PO BOX 68, FORT FAIRFIELD, ME 04742-0068
PO BOX 69, FORT FAIRFIELD, ME 04742-0069
PO BOX 70, FORT FAIRFIELD, ME 04742-0070
PO BOX 71, FORT FAIRFIELD, ME 04742-0071
PO BOX 72, FORT FAIRFIELD, ME 04742-0072
PO BOX 73, FORT FAIRFIELD, ME 04742-0073
PO BOX 74, FORT FAIRFIELD, ME 04742-0074
PO BOX 75, FORT FAIRFIELD, ME 04742-0075
PO BOX 76, FORT FAIRFIELD, ME 04742-0076
PO BOX 77, FORT FAIRFIELD, ME 04742-0077
PO BOX 78, FORT FAIRFIELD, ME 04742-0078
PO BOX 79, FORT FAIRFIELD, ME 04742-0079
PO BOX 80, FORT FAIRFIELD, ME 04742-0080
PO BOX 81, FORT FAIRFIELD, ME 04742-0081
PO BOX 82, FORT FAIRFIELD, ME 04742-0082
PO BOX 83, FORT FAIRFIELD, ME 04742-0083
PO BOX 84, FORT FAIRFIELD, ME 04742-0084
PO BOX 85, FORT FAIRFIELD, ME 04742-0085
PO BOX 86, FORT FAIRFIELD, ME 04742-0086
PO BOX 87, FORT FAIRFIELD, ME 04742-0087
PO BOX 88, FORT FAIRFIELD, ME 04742-0088
PO BOX 89, FORT FAIRFIELD, ME 04742-0089
PO BOX 90, FORT FAIRFIELD, ME 04742-0090
PO BOX 91, FORT FAIRFIELD, ME 04742-0091
PO BOX 92, FORT FAIRFIELD, ME 04742-0092
PO BOX 93, FORT FAIRFIELD, ME 04742-0093
PO BOX 94, FORT FAIRFIELD, ME 04742-0094
PO BOX 95, FORT FAIRFIELD, ME 04742-0095
PO BOX 96, FORT FAIRFIELD, ME 04742-0096
PO BOX 97, FORT FAIRFIELD, ME 04742-0097
PO BOX 98, FORT FAIRFIELD, ME 04742-0098
PO BOX 99, FORT FAIRFIELD, ME 04742-0099
PO BOX 100, FORT FAIRFIELD, ME 04742-0100
PO BOX 101, FORT FAIRFIELD, ME 04742-0101
PO BOX 102, FORT FAIRFIELD, ME 04742-0102
PO BOX 103, FORT FAIRFIELD, ME 04742-0103
PO BOX 104, FORT FAIRFIELD, ME 04742-0104
PO BOX 105, FORT FAIRFIELD, ME 04742-0105
PO BOX 106, FORT FAIRFIELD, ME 04742-0106
PO BOX 107, FORT FAIRFIELD, ME 04742-0107
PO BOX 108, FORT FAIRFIELD, ME 04742-0108
PO BOX 109, FORT FAIRFIELD, ME 04742-0109
PO BOX 110, FORT FAIRFIELD, ME 04742-0110
PO BOX 111, FORT FAIRFIELD, ME 04742-0111
PO BOX 112, FORT FAIRFIELD, ME 04742-0112
PO BOX 113, FORT FAIRFIELD, ME 04742-0113
PO BOX 114, FORT FAIRFIELD, ME 04742-0114
PO BOX 115, FORT FAIRFIELD, ME 04742-0115
PO BOX 116, FORT FAIRFIELD, ME 04742-0116
PO BOX 117, FORT FAIRFIELD, ME 04742-0117
PO BOX 118, FORT FAIRFIELD, ME 04742-0118
PO BOX 119, FORT FAIRFIELD, ME 04742-0119
PO BOX 120, FORT FAIRFIELD, ME 04742-0120
PO BOX 121, FORT FAIRFIELD, ME 04742-0121
PO BOX 122, FORT FAIRFIELD, ME 04742-0122
PO BOX 123, FORT FAIRFIELD, ME 04742-0123
PO BOX 124, FORT FAIRFIELD, ME 04742-0124
PO BOX 125, FORT FAIRFIELD, ME 04742-0125
PO BOX 126, FORT FAIRFIELD, ME 04742-0126
PO BOX 127, FORT FAIRFIELD, ME 04742-0127
PO BOX 128, FORT FAIRFIELD, ME 04742-0128
PO BOX 129, FORT FAIRFIELD, ME 04742-0129
PO BOX 130, FORT FAIRFIELD, ME 04742-0130
PO BOX 131, FORT FAIRFIELD, ME 04742-0131
PO BOX 132, FORT FAIRFIELD, ME 04742-0132
PO BOX 133, FORT FAIRFIELD, ME 04742-0133
PO BOX 134, FORT FAIRFIELD, ME 04742-0134
PO BOX 135, FORT FAIRFIELD, ME 04742-0135
PO BOX 136, FORT FAIRFIELD, ME 04742-0136
PO BOX 137, FORT FAIRFIELD, ME 04742-0137
PO BOX 138, FORT FAIRFIELD, ME 04742-0138
PO BOX 139, FORT FAIRFIELD, ME 04742-0139
PO BOX 140, FORT FAIRFIELD, ME 04742-0140
PO BOX 141, FORT FAIRFIELD, ME 04742-0141
PO BOX 142, FORT FAIRFIELD, ME 04742-0142
PO BOX 143, FORT FAIRFIELD, ME 04742-0143
PO BOX 144, FORT FAIRFIELD, ME 04742-0144
PO BOX 145, FORT FAIRFIELD, ME 04742-0145
PO BOX 146, FORT FAIRFIELD, ME 04742-0146
PO BOX 147, FORT FAIRFIELD, ME 04742-0147
PO BOX 148, FORT FAIRFIELD, ME 04742-0148
PO BOX 149, FORT FAIRFIELD, ME 04742-0149
PO BOX 150, FORT FAIRFIELD, ME 04742-0150
PO BOX 151, FORT FAIRFIELD, ME 04742-0151
PO BOX 152, FORT FAIRFIELD, ME 04742-0152
PO BOX 153, FORT FAIRFIELD, ME 04742-0153
PO BOX 154, FORT FAIRFIELD, ME 04742-0154
PO BOX 155, FORT FAIRFIELD, ME 04742-0155
PO BOX 156, FORT FAIRFIELD, ME 04742-0156
PO BOX 157, FORT FAIRFIELD, ME 04742-0157
PO BOX 158, FORT FAIRFIELD, ME 04742-0158
PO BOX 159, FORT FAIRFIELD, ME 04742-0159
PO BOX 160, FORT FAIRFIELD, ME 04742-0160
PO BOX 161, FORT FAIRFIELD, ME 04742-0161
PO BOX 162, FORT FAIRFIELD, ME 04742-0162
PO BOX 163, FORT FAIRFIELD, ME 04742-0163
PO BOX 164, FORT FAIRFIELD, ME 04742-0164
PO BOX 165, FORT FAIRFIELD, ME 04742-0165
PO BOX 166, FORT FAIRFIELD, ME 04742-0166
PO BOX 167, FORT FAIRFIELD, ME 04742-0167
PO BOX 168, FORT FAIRFIELD, ME 04742-0168
PO BOX 169, FORT FAIRFIELD, ME 04742-0169
PO BOX 170, FORT FAIRFIELD, ME 04742-0170
PO BOX 171, FORT FAIRFIELD, ME 04742-0171
PO BOX 172, FORT FAIRFIELD, ME 04742-0172
PO BOX 173, FORT FAIRFIELD, ME 04742-0173
PO BOX 174, FORT FAIRFIELD, ME 04742-0174
PO BOX 175, FORT FAIRFIELD, ME 04742-0175
PO BOX 176, FORT FAIRFIELD, ME 04742-0176
PO BOX 177, FORT FAIRFIELD, ME 04742-0177
PO BOX 178, FORT FAIRFIELD, ME 04742-0178
PO BOX 179, FORT FAIRFIELD, ME 04742-0179
PO BOX 180, FORT FAIRFIELD, ME 04742-0180
PO BOX 181, FORT FAIRFIELD, ME 04742-0181
PO BOX 182, FORT FAIRFIELD, ME 04742-0182
PO BOX 183, FORT FAIRFIELD, ME 04742-0183
PO BOX 184, FORT FAIRFIELD, ME 04742-0184
PO BOX 185, FORT FAIRFIELD, ME 04742-0185
PO BOX 186, FORT FAIRFIELD, ME 04742-0186
PO BOX 187, FORT FAIRFIELD, ME 04742-0187
PO BOX 188, FORT FAIRFIELD, ME 04742-0188
PO BOX 189, FORT FAIRFIELD, ME 04742-0189
PO BOX 190, FORT FAIRFIELD, ME 04742-0190
PO BOX 191, FORT FAIRFIELD, ME 04742-0191
PO BOX 192, FORT FAIRFIELD, ME 04742-0192
PO BOX 193, FORT FAIRFIELD, ME 04742-0193
PO BOX 194, FORT FAIRFIELD, ME 04742-0194
PO BOX 195, FORT FAIRFIELD, ME 04742-0195
PO BOX 196, FORT FAIRFIELD, ME 04742-0196
PO BOX 197, FORT FAIRFIELD, ME 04742-0197
PO BOX 198, FORT FAIRFIELD, ME 04742-0198
PO BOX 199, FORT FAIRFIELD, ME 04742-0199
PO BOX 200, FORT FAIRFIELD, ME 04742-0200
PO BOX 201, FORT FAIRFIELD, ME 04742-0201
PO BOX 202, FORT FAIRFIELD, ME 04742-0202
PO BOX 203, FORT FAIRFIELD, ME 04742-0203
PO BOX 204, FORT FAIRFIELD, ME 04742-0204
PO BOX 205, FORT FAIRFIELD, ME 04742-0205
PO BOX 206, FORT FAIRFIELD, ME 04742-0206
PO BOX 207, FORT FAIRFIELD, ME 04742-0207
PO BOX 208, FORT FAIRFIELD, ME 04742-0208
PO BOX 209, FORT FAIRFIELD, ME 04742-0209
PO BOX 210, FORT FAIRFIELD, ME 04742-0210
PO BOX 211, FORT FAIRFIELD, ME 04742-0211
PO BOX 212, FORT FAIRFIELD, ME 04742-0212
PO BOX 213, FORT FAIRFIELD, ME 04742-0213
PO BOX 214, FORT FAIRFIELD, ME 04742-0214
PO BOX 215, FORT FAIRFIELD, ME 04742-0215
PO BOX 216, FORT FAIRFIELD, ME 04742-0216
PO BOX 217, FORT FAIRFIELD, ME 04742-0217
PO BOX 218, FORT FAIRFIELD, ME 04742-0218
PO BOX 219, FORT FAIRFIELD, ME 04742-0219
PO BOX 220, FORT FAIRFIELD, ME 04742-0220
PO BOX 221, FORT FAIRFIELD, ME 04742-0221
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