Číslo PO BOXU může být menší nebo více než čtyřmístné. U poštovních schránek obecně platí, že každá schránka má svůj vlastní kód ZIP + 4.
Poslední čtyři číslice jsou často jednou z následujících možností:
1. Nula plus poslední tři číslice čísla krabice (eg. PO BOX 1001, Los Angeles CA 90001-0001).
2. Poslední čtyři číslice čísla rámečku (eg. PO BOX 9991, Twin Peaks CA 92391-9991).
3. Pokud je číslo rámečku menší než čtyři číslice, před nulou čísla rámečku se předloží dostatek nul, aby vzniklo čtyřmístné číslo(eg. PO BOX 1, Shreveport LA 71161-0001).
Neexistuje však jednotné pravidlo, poštovní směrovací číslo plus čtyři slouží pouze pro informaci, poštovní směrovací číslo ZIP + 4 musí být vyhledáno jednotlivě pro každé políčko na oficiálním webu USPS.
PO BOX 31, WILLIAMSPORT, IN 47993-0031
PO BOX 32, WILLIAMSPORT, IN 47993-0032
PO BOX 33, WILLIAMSPORT, IN 47993-0033
PO BOX 34, WILLIAMSPORT, IN 47993-0034
PO BOX 35, WILLIAMSPORT, IN 47993-0035
PO BOX 36, WILLIAMSPORT, IN 47993-0036
PO BOX 37, WILLIAMSPORT, IN 47993-0037
PO BOX 38, WILLIAMSPORT, IN 47993-0038
PO BOX 39, WILLIAMSPORT, IN 47993-0039
PO BOX 40, WILLIAMSPORT, IN 47993-0040
PO BOX 41, WILLIAMSPORT, IN 47993-0041
PO BOX 42, WILLIAMSPORT, IN 47993-0042
PO BOX 43, WILLIAMSPORT, IN 47993-0043
PO BOX 44, WILLIAMSPORT, IN 47993-0044
PO BOX 45, WILLIAMSPORT, IN 47993-0045
PO BOX 46, WILLIAMSPORT, IN 47993-0046
PO BOX 47, WILLIAMSPORT, IN 47993-0047
PO BOX 48, WILLIAMSPORT, IN 47993-0048
PO BOX 49, WILLIAMSPORT, IN 47993-0049
PO BOX 50, WILLIAMSPORT, IN 47993-0050
PO BOX 51, WILLIAMSPORT, IN 47993-0051
PO BOX 52, WILLIAMSPORT, IN 47993-0052
PO BOX 53, WILLIAMSPORT, IN 47993-0053
PO BOX 54, WILLIAMSPORT, IN 47993-0054
PO BOX 55, WILLIAMSPORT, IN 47993-0055
PO BOX 56, WILLIAMSPORT, IN 47993-0056
PO BOX 57, WILLIAMSPORT, IN 47993-0057
PO BOX 58, WILLIAMSPORT, IN 47993-0058
PO BOX 59, WILLIAMSPORT, IN 47993-0059
PO BOX 60, WILLIAMSPORT, IN 47993-0060
PO BOX 61, WILLIAMSPORT, IN 47993-0061
PO BOX 62, WILLIAMSPORT, IN 47993-0062
PO BOX 63, WILLIAMSPORT, IN 47993-0063
PO BOX 64, WILLIAMSPORT, IN 47993-0064
PO BOX 65, WILLIAMSPORT, IN 47993-0065
PO BOX 66, WILLIAMSPORT, IN 47993-0066
PO BOX 67, WILLIAMSPORT, IN 47993-0067
PO BOX 68, WILLIAMSPORT, IN 47993-0068
PO BOX 69, WILLIAMSPORT, IN 47993-0069
PO BOX 70, WILLIAMSPORT, IN 47993-0070
PO BOX 71, WILLIAMSPORT, IN 47993-0071
PO BOX 72, WILLIAMSPORT, IN 47993-0072
PO BOX 73, WILLIAMSPORT, IN 47993-0073
PO BOX 74, WILLIAMSPORT, IN 47993-0074
PO BOX 75, WILLIAMSPORT, IN 47993-0075
PO BOX 76, WILLIAMSPORT, IN 47993-0076
PO BOX 77, WILLIAMSPORT, IN 47993-0077
PO BOX 78, WILLIAMSPORT, IN 47993-0078
PO BOX 79, WILLIAMSPORT, IN 47993-0079
PO BOX 80, WILLIAMSPORT, IN 47993-0080
PO BOX 81, WILLIAMSPORT, IN 47993-0081
PO BOX 82, WILLIAMSPORT, IN 47993-0082
PO BOX 83, WILLIAMSPORT, IN 47993-0083
PO BOX 84, WILLIAMSPORT, IN 47993-0084
PO BOX 85, WILLIAMSPORT, IN 47993-0085
PO BOX 86, WILLIAMSPORT, IN 47993-0086
PO BOX 87, WILLIAMSPORT, IN 47993-0087
PO BOX 88, WILLIAMSPORT, IN 47993-0088
PO BOX 89, WILLIAMSPORT, IN 47993-0089
PO BOX 90, WILLIAMSPORT, IN 47993-0090
PO BOX 91, WILLIAMSPORT, IN 47993-0091
PO BOX 92, WILLIAMSPORT, IN 47993-0092
PO BOX 93, WILLIAMSPORT, IN 47993-0093
PO BOX 94, WILLIAMSPORT, IN 47993-0094
PO BOX 95, WILLIAMSPORT, IN 47993-0095
PO BOX 96, WILLIAMSPORT, IN 47993-0096
PO BOX 97, WILLIAMSPORT, IN 47993-0097
PO BOX 98, WILLIAMSPORT, IN 47993-0098
PO BOX 99, WILLIAMSPORT, IN 47993-0099
PO BOX 100, WILLIAMSPORT, IN 47993-0100
PO BOX 101, WILLIAMSPORT, IN 47993-0101
PO BOX 102, WILLIAMSPORT, IN 47993-0102
PO BOX 103, WILLIAMSPORT, IN 47993-0103
PO BOX 104, WILLIAMSPORT, IN 47993-0104
PO BOX 105, WILLIAMSPORT, IN 47993-0105
PO BOX 106, WILLIAMSPORT, IN 47993-0106
PO BOX 107, WILLIAMSPORT, IN 47993-0107
PO BOX 108, WILLIAMSPORT, IN 47993-0108
PO BOX 109, WILLIAMSPORT, IN 47993-0109
PO BOX 110, WILLIAMSPORT, IN 47993-0110
PO BOX 111, WILLIAMSPORT, IN 47993-0111
PO BOX 112, WILLIAMSPORT, IN 47993-0112
PO BOX 113, WILLIAMSPORT, IN 47993-0113
PO BOX 114, WILLIAMSPORT, IN 47993-0114
PO BOX 115, WILLIAMSPORT, IN 47993-0115
PO BOX 116, WILLIAMSPORT, IN 47993-0116
PO BOX 117, WILLIAMSPORT, IN 47993-0117
PO BOX 118, WILLIAMSPORT, IN 47993-0118
PO BOX 119, WILLIAMSPORT, IN 47993-0119
PO BOX 120, WILLIAMSPORT, IN 47993-0120
PO BOX 121, WILLIAMSPORT, IN 47993-0121
PO BOX 122, WILLIAMSPORT, IN 47993-0122
PO BOX 123, WILLIAMSPORT, IN 47993-0123
PO BOX 124, WILLIAMSPORT, IN 47993-0124
PO BOX 125, WILLIAMSPORT, IN 47993-0125
PO BOX 126, WILLIAMSPORT, IN 47993-0126
PO BOX 127, WILLIAMSPORT, IN 47993-0127
PO BOX 128, WILLIAMSPORT, IN 47993-0128
PO BOX 129, WILLIAMSPORT, IN 47993-0129
PO BOX 130, WILLIAMSPORT, IN 47993-0130
PO BOX 131, WILLIAMSPORT, IN 47993-0131
PO BOX 132, WILLIAMSPORT, IN 47993-0132
PO BOX 133, WILLIAMSPORT, IN 47993-0133
PO BOX 134, WILLIAMSPORT, IN 47993-0134
PO BOX 135, WILLIAMSPORT, IN 47993-0135
PO BOX 136, WILLIAMSPORT, IN 47993-0136
PO BOX 137, WILLIAMSPORT, IN 47993-0137
PO BOX 138, WILLIAMSPORT, IN 47993-0138
PO BOX 139, WILLIAMSPORT, IN 47993-0139
PO BOX 140, WILLIAMSPORT, IN 47993-0140
PO BOX 141, WILLIAMSPORT, IN 47993-0141
PO BOX 142, WILLIAMSPORT, IN 47993-0142
PO BOX 143, WILLIAMSPORT, IN 47993-0143
PO BOX 144, WILLIAMSPORT, IN 47993-0144
PO BOX 145, WILLIAMSPORT, IN 47993-0145
PO BOX 146, WILLIAMSPORT, IN 47993-0146
PO BOX 147, WILLIAMSPORT, IN 47993-0147
PO BOX 148, WILLIAMSPORT, IN 47993-0148
PO BOX 149, WILLIAMSPORT, IN 47993-0149
PO BOX 150, WILLIAMSPORT, IN 47993-0150
PO BOX 151, WILLIAMSPORT, IN 47993-0151
PO BOX 152, WILLIAMSPORT, IN 47993-0152
PO BOX 153, WILLIAMSPORT, IN 47993-0153
PO BOX 154, WILLIAMSPORT, IN 47993-0154
PO BOX 155, WILLIAMSPORT, IN 47993-0155
PO BOX 156, WILLIAMSPORT, IN 47993-0156
PO BOX 157, WILLIAMSPORT, IN 47993-0157
PO BOX 158, WILLIAMSPORT, IN 47993-0158
PO BOX 159, WILLIAMSPORT, IN 47993-0159
PO BOX 160, WILLIAMSPORT, IN 47993-0160
PO BOX 161, WILLIAMSPORT, IN 47993-0161
PO BOX 162, WILLIAMSPORT, IN 47993-0162
PO BOX 163, WILLIAMSPORT, IN 47993-0163
PO BOX 164, WILLIAMSPORT, IN 47993-0164
PO BOX 165, WILLIAMSPORT, IN 47993-0165
PO BOX 166, WILLIAMSPORT, IN 47993-0166
PO BOX 167, WILLIAMSPORT, IN 47993-0167
PO BOX 168, WILLIAMSPORT, IN 47993-0168
PO BOX 169, WILLIAMSPORT, IN 47993-0169
PO BOX 170, WILLIAMSPORT, IN 47993-0170
PO BOX 171, WILLIAMSPORT, IN 47993-0171
PO BOX 172, WILLIAMSPORT, IN 47993-0172
PO BOX 173, WILLIAMSPORT, IN 47993-0173
PO BOX 174, WILLIAMSPORT, IN 47993-0174
PO BOX 175, WILLIAMSPORT, IN 47993-0175
PO BOX 176, WILLIAMSPORT, IN 47993-0176
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