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 1, SPRINGFIELD, MA 01101-0001
PO BOX 2, SPRINGFIELD, MA 01101-0002
PO BOX 3, SPRINGFIELD, MA 01101-0003
PO BOX 4, SPRINGFIELD, MA 01101-0004
PO BOX 5, SPRINGFIELD, MA 01101-0005
PO BOX 6, SPRINGFIELD, MA 01101-0006
PO BOX 7, SPRINGFIELD, MA 01101-0007
PO BOX 8, SPRINGFIELD, MA 01101-0008
PO BOX 9, SPRINGFIELD, MA 01101-0009
PO BOX 10, SPRINGFIELD, MA 01101-0010
PO BOX 11, SPRINGFIELD, MA 01101-0011
PO BOX 12, SPRINGFIELD, MA 01101-0012
PO BOX 13, SPRINGFIELD, MA 01101-0013
PO BOX 14, SPRINGFIELD, MA 01101-0014
PO BOX 15, SPRINGFIELD, MA 01101-0015
PO BOX 16, SPRINGFIELD, MA 01101-0016
PO BOX 17, SPRINGFIELD, MA 01101-0017
PO BOX 18, SPRINGFIELD, MA 01101-0018
PO BOX 19, SPRINGFIELD, MA 01101-0019
PO BOX 20, SPRINGFIELD, MA 01101-0020
PO BOX 21, SPRINGFIELD, MA 01101-0021
PO BOX 22, SPRINGFIELD, MA 01101-0022
PO BOX 23, SPRINGFIELD, MA 01101-0023
PO BOX 24, SPRINGFIELD, MA 01101-0024
PO BOX 25, SPRINGFIELD, MA 01101-0025
PO BOX 26, SPRINGFIELD, MA 01101-0026
PO BOX 27, SPRINGFIELD, MA 01101-0027
PO BOX 28, SPRINGFIELD, MA 01101-0028
PO BOX 29, SPRINGFIELD, MA 01101-0029
PO BOX 30, SPRINGFIELD, MA 01101-0030
PO BOX 31, SPRINGFIELD, MA 01101-0031
PO BOX 32, SPRINGFIELD, MA 01101-0032
PO BOX 33, SPRINGFIELD, MA 01101-0033
PO BOX 34, SPRINGFIELD, MA 01101-0034
PO BOX 35, SPRINGFIELD, MA 01101-0035
PO BOX 36, SPRINGFIELD, MA 01101-0036
PO BOX 37, SPRINGFIELD, MA 01101-0037
PO BOX 38, SPRINGFIELD, MA 01101-0038
PO BOX 39, SPRINGFIELD, MA 01101-0039
PO BOX 40, SPRINGFIELD, MA 01101-0040
PO BOX 41, SPRINGFIELD, MA 01101-0041
PO BOX 42, SPRINGFIELD, MA 01101-0042
PO BOX 43, SPRINGFIELD, MA 01101-0043
PO BOX 44, SPRINGFIELD, MA 01101-0044
PO BOX 45, SPRINGFIELD, MA 01101-0045
PO BOX 46, SPRINGFIELD, MA 01101-0046
PO BOX 47, SPRINGFIELD, MA 01101-0047
PO BOX 48, SPRINGFIELD, MA 01101-0048
PO BOX 49, SPRINGFIELD, MA 01101-0049
PO BOX 50, SPRINGFIELD, MA 01101-0050
PO BOX 51, SPRINGFIELD, MA 01101-0051
PO BOX 52, SPRINGFIELD, MA 01101-0052
PO BOX 53, SPRINGFIELD, MA 01101-0053
PO BOX 54, SPRINGFIELD, MA 01101-0054
PO BOX 55, SPRINGFIELD, MA 01101-0055
PO BOX 56, SPRINGFIELD, MA 01101-0056
PO BOX 57, SPRINGFIELD, MA 01101-0057
PO BOX 58, SPRINGFIELD, MA 01101-0058
PO BOX 59, SPRINGFIELD, MA 01101-0059
PO BOX 60, SPRINGFIELD, MA 01101-0060
PO BOX 61, SPRINGFIELD, MA 01101-0061
PO BOX 62, SPRINGFIELD, MA 01101-0062
PO BOX 63, SPRINGFIELD, MA 01101-0063
PO BOX 64, SPRINGFIELD, MA 01101-0064
PO BOX 65, SPRINGFIELD, MA 01101-0065
PO BOX 66, SPRINGFIELD, MA 01101-0066
PO BOX 67, SPRINGFIELD, MA 01101-0067
PO BOX 68, SPRINGFIELD, MA 01101-0068
PO BOX 69, SPRINGFIELD, MA 01101-0069
PO BOX 70, SPRINGFIELD, MA 01101-0070
PO BOX 71, SPRINGFIELD, MA 01101-0071
PO BOX 72, SPRINGFIELD, MA 01101-0072
PO BOX 73, SPRINGFIELD, MA 01101-0073
PO BOX 74, SPRINGFIELD, MA 01101-0074
PO BOX 75, SPRINGFIELD, MA 01101-0075
PO BOX 76, SPRINGFIELD, MA 01101-0076
PO BOX 77, SPRINGFIELD, MA 01101-0077
PO BOX 78, SPRINGFIELD, MA 01101-0078
PO BOX 79, SPRINGFIELD, MA 01101-0079
PO BOX 80, SPRINGFIELD, MA 01101-0080
PO BOX 81, SPRINGFIELD, MA 01101-0081
PO BOX 82, SPRINGFIELD, MA 01101-0082
PO BOX 83, SPRINGFIELD, MA 01101-0083
PO BOX 84, SPRINGFIELD, MA 01101-0084
PO BOX 85, SPRINGFIELD, MA 01101-0085
PO BOX 86, SPRINGFIELD, MA 01101-0086
PO BOX 87, SPRINGFIELD, MA 01101-0087
PO BOX 88, SPRINGFIELD, MA 01101-0088
PO BOX 89, SPRINGFIELD, MA 01101-0089
PO BOX 90, SPRINGFIELD, MA 01101-0090
PO BOX 91, SPRINGFIELD, MA 01101-0091
PO BOX 92, SPRINGFIELD, MA 01101-0092
PO BOX 93, SPRINGFIELD, MA 01101-0093
PO BOX 94, SPRINGFIELD, MA 01101-0094
PO BOX 95, SPRINGFIELD, MA 01101-0095
PO BOX 96, SPRINGFIELD, MA 01101-0096
PO BOX 97, SPRINGFIELD, MA 01101-0097
PO BOX 98, SPRINGFIELD, MA 01101-0098
PO BOX 99, SPRINGFIELD, MA 01101-0099
PO BOX 100, SPRINGFIELD, MA 01101-0100
PO BOX 101, SPRINGFIELD, MA 01101-0101
PO BOX 102, SPRINGFIELD, MA 01101-0102
PO BOX 103, SPRINGFIELD, MA 01101-0103
PO BOX 104, SPRINGFIELD, MA 01101-0104
PO BOX 105, SPRINGFIELD, MA 01101-0105
PO BOX 106, SPRINGFIELD, MA 01101-0106
PO BOX 107, SPRINGFIELD, MA 01101-0107
PO BOX 108, SPRINGFIELD, MA 01101-0108
PO BOX 109, SPRINGFIELD, MA 01101-0109
PO BOX 110, SPRINGFIELD, MA 01101-0110
PO BOX 111, SPRINGFIELD, MA 01101-0111
PO BOX 112, SPRINGFIELD, MA 01101-0112
PO BOX 113, SPRINGFIELD, MA 01101-0113
PO BOX 114, SPRINGFIELD, MA 01101-0114
PO BOX 115, SPRINGFIELD, MA 01101-0115
PO BOX 116, SPRINGFIELD, MA 01101-0116
PO BOX 117, SPRINGFIELD, MA 01101-0117
PO BOX 118, SPRINGFIELD, MA 01101-0118
PO BOX 119, SPRINGFIELD, MA 01101-0119
PO BOX 120, SPRINGFIELD, MA 01101-0120
PO BOX 121, SPRINGFIELD, MA 01101-0121
PO BOX 122, SPRINGFIELD, MA 01101-0122
PO BOX 123, SPRINGFIELD, MA 01101-0123
PO BOX 124, SPRINGFIELD, MA 01101-0124
PO BOX 125, SPRINGFIELD, MA 01101-0125
PO BOX 126, SPRINGFIELD, MA 01101-0126
PO BOX 127, SPRINGFIELD, MA 01101-0127
PO BOX 128, SPRINGFIELD, MA 01101-0128
PO BOX 129, SPRINGFIELD, MA 01101-0129
PO BOX 130, SPRINGFIELD, MA 01101-0130
PO BOX 131, SPRINGFIELD, MA 01101-0131
PO BOX 132, SPRINGFIELD, MA 01101-0132
PO BOX 133, SPRINGFIELD, MA 01101-0133
PO BOX 134, SPRINGFIELD, MA 01101-0134
PO BOX 135, SPRINGFIELD, MA 01101-0135
PO BOX 136, SPRINGFIELD, MA 01101-0136
PO BOX 137, SPRINGFIELD, MA 01101-0137
PO BOX 138, SPRINGFIELD, MA 01101-0138
PO BOX 139, SPRINGFIELD, MA 01101-0139
PO BOX 140, SPRINGFIELD, MA 01101-0140
PO BOX 141, SPRINGFIELD, MA 01101-0141
PO BOX 142, SPRINGFIELD, MA 01101-0142
PO BOX 143, SPRINGFIELD, MA 01101-0143
PO BOX 144, SPRINGFIELD, MA 01101-0144
PO BOX 145, SPRINGFIELD, MA 01101-0145
PO BOX 146, SPRINGFIELD, MA 01101-0146
PO BOX 147, SPRINGFIELD, MA 01101-0147
PO BOX 148, SPRINGFIELD, MA 01101-0148
PO BOX 149, SPRINGFIELD, MA 01101-0149
PO BOX 150, SPRINGFIELD, MA 01101-0150
PO BOX 151, SPRINGFIELD, MA 01101-0151
PO BOX 152, SPRINGFIELD, MA 01101-0152
PO BOX 153, SPRINGFIELD, MA 01101-0153
PO BOX 154, SPRINGFIELD, MA 01101-0154
PO BOX 155, SPRINGFIELD, MA 01101-0155
PO BOX 156, SPRINGFIELD, MA 01101-0156
PO BOX 157, SPRINGFIELD, MA 01101-0157
PO BOX 158, SPRINGFIELD, MA 01101-0158
PO BOX 159, SPRINGFIELD, MA 01101-0159
PO BOX 160, SPRINGFIELD, MA 01101-0160
PO BOX 161, SPRINGFIELD, MA 01101-0161
PO BOX 162, SPRINGFIELD, MA 01101-0162
PO BOX 163, SPRINGFIELD, MA 01101-0163
PO BOX 164, SPRINGFIELD, MA 01101-0164
PO BOX 165, SPRINGFIELD, MA 01101-0165
PO BOX 166, SPRINGFIELD, MA 01101-0166
PO BOX 167, SPRINGFIELD, MA 01101-0167
PO BOX 168, SPRINGFIELD, MA 01101-0168
PO BOX 169, SPRINGFIELD, MA 01101-0169
PO BOX 170, SPRINGFIELD, MA 01101-0170
PO BOX 171, SPRINGFIELD, MA 01101-0171
PO BOX 172, SPRINGFIELD, MA 01101-0172
PO BOX 173, SPRINGFIELD, MA 01101-0173
PO BOX 174, SPRINGFIELD, MA 01101-0174
PO BOX 175, SPRINGFIELD, MA 01101-0175
PO BOX 176, SPRINGFIELD, MA 01101-0176
PO BOX 177, SPRINGFIELD, MA 01101-0177
PO BOX 178, SPRINGFIELD, MA 01101-0178
PO BOX 179, SPRINGFIELD, MA 01101-0179
PO BOX 180, SPRINGFIELD, MA 01101-0180
PO BOX 181, SPRINGFIELD, MA 01101-0181
PO BOX 182, SPRINGFIELD, MA 01101-0182
PO BOX 183, SPRINGFIELD, MA 01101-0183
PO BOX 184, SPRINGFIELD, MA 01101-0184
PO BOX 185, SPRINGFIELD, MA 01101-0185
PO BOX 186, SPRINGFIELD, MA 01101-0186
PO BOX 187, SPRINGFIELD, MA 01101-0187
PO BOX 188, SPRINGFIELD, MA 01101-0188
PO BOX 189, SPRINGFIELD, MA 01101-0189
PO BOX 190, SPRINGFIELD, MA 01101-0190
PO BOX 191, SPRINGFIELD, MA 01101-0191
PO BOX 192, SPRINGFIELD, MA 01101-0192
PO BOX 193, SPRINGFIELD, MA 01101-0193
PO BOX 194, SPRINGFIELD, MA 01101-0194
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