PO Box Cost: USPS Fees by Fee Group, Box Size and Term
A USPS PO Box costs from $21.00 for three months (Market Dominant, fee group 7, box size 1) to $677.00 for six months (Competitive, fee group C30, box size 5). The fee depends on the fee group of the Post Office, the box size and the term, and the tables below show every combination Notice 123 prints.
Maintained by Archie Chang · Fees checked against USPS Price List Notice 123 on November 2, 2026 · Methodology & sources
Which table applies
Notice 123 has one set of tables for Competitive locations and one for Market Dominant locations, each for a six-month and a three-month term. Competitive fee groups are C30 to C44 and Market Dominant fee groups are 1 to 7 and E. Columns 1 to 5 are the box sizes as Notice 123 numbers them.
“The ZIP Codes for Competitive locations and their assigned fee groups may be found at usps.com/manage/po-boxes.htm or your local Post Office.”
This page does not match ZIP Codes to fee groups. Ask your Post Office, or use the USPS page named in the quote, for the fee group of the location you want.
Competitive locations
| Fee group | Box size 1 | Box size 2 | Box size 3 | Box size 4 | Box size 5 |
|---|---|---|---|---|---|
| C30 | $170.00 | $225.00 | $395.00 | $452.00 | $677.00 |
| C31 | $133.00 | $170.00 | $269.00 | $321.00 | $450.00 |
| C32 | $125.00 | $158.00 | $251.00 | $301.00 | $420.00 |
| C33 | $111.00 | $142.00 | $225.00 | $270.00 | $379.00 |
| C34 | $101.00 | $129.00 | $205.00 | $246.00 | $345.00 |
| C35 | $97.00 | $118.00 | $194.00 | $232.00 | $309.00 |
| C36 | $85.00 | $110.00 | $171.00 | $205.00 | $286.00 |
| C37 | $80.00 | $103.00 | $161.00 | $193.00 | $270.00 |
| C38 | $133.00 | $170.00 | $269.00 | $321.00 | $450.00 |
| C39 | $125.00 | $158.00 | $251.00 | $301.00 | $420.00 |
| C40 | $111.00 | $142.00 | $225.00 | $270.00 | $379.00 |
| C41 | $101.00 | $129.00 | $205.00 | $246.00 | $345.00 |
| C42 | $97.00 | $118.00 | $194.00 | $232.00 | $309.00 |
| C43 | $85.00 | $110.00 | $171.00 | $205.00 | $286.00 |
| C44 | $80.00 | $103.00 | $161.00 | $193.00 | $270.00 |
| Fee group | Box size 1 | Box size 2 | Box size 3 | Box size 4 | Box size 5 |
|---|---|---|---|---|---|
| C30 | $98.00 | $130.00 | $228.00 | $259.00 | $389.00 |
| C31 | $77.00 | $99.00 | $155.00 | $186.00 | $260.00 |
| C32 | $72.00 | $92.00 | $146.00 | $174.00 | $244.00 |
| C33 | $65.00 | $82.00 | $131.00 | $156.00 | $219.00 |
| C34 | $59.00 | $75.00 | $118.00 | $143.00 | $200.00 |
| C35 | $57.00 | $69.00 | $112.00 | $135.00 | $179.00 |
| C36 | $49.00 | $64.00 | $99.00 | $118.00 | $166.00 |
| C37 | $46.00 | $60.00 | $93.00 | $111.00 | $156.00 |
| C38 | $77.00 | $99.00 | $155.00 | $186.00 | $260.00 |
| C39 | $72.00 | $92.00 | $146.00 | $174.00 | $244.00 |
| C40 | $65.00 | $82.00 | $131.00 | $156.00 | $219.00 |
| C41 | $59.00 | $75.00 | $118.00 | $143.00 | $200.00 |
| C42 | $57.00 | $69.00 | $112.00 | $135.00 | $179.00 |
| C43 | $49.00 | $64.00 | $99.00 | $118.00 | $166.00 |
| C44 | $46.00 | $60.00 | $93.00 | $111.00 | $156.00 |
Market Dominant locations
Notice 123 prints no fees for Market Dominant fee group E (shown as “-”) and no three-month row for it.
| Fee group | Box size 1 | Box size 2 | Box size 3 | Box size 4 | Box size 5 |
|---|---|---|---|---|---|
| 1 | $81.00 | $118.00 | $206.00 | $355.00 | $553.00 |
| 2 | $65.00 | $98.00 | $166.00 | $293.00 | $455.00 |
| 3 | $55.00 | $79.00 | $137.00 | $239.00 | $372.00 |
| 4 | $45.00 | $66.00 | $105.00 | $194.00 | $313.00 |
| 5 | $40.00 | $56.00 | $86.00 | $148.00 | $235.00 |
| 6 | $35.00 | $47.00 | $67.00 | $109.00 | $190.00 |
| 7 | $31.00 | $41.00 | $60.00 | $90.00 | $156.00 |
| E | - | - | - | - | - |
| Fee group | Box size 1 | Box size 2 | Box size 3 | Box size 4 | Box size 5 |
|---|---|---|---|---|---|
| 1 | $50.00 | $72.00 | $126.00 | $216.00 | $339.00 |
| 2 | $40.00 | $60.00 | $101.00 | $178.00 | $279.00 |
| 3 | $34.00 | $50.00 | $83.00 | $145.00 | $228.00 |
| 4 | $29.00 | $41.00 | $63.00 | $116.00 | $192.00 |
| 5 | $25.00 | $35.00 | $51.00 | $88.00 | $145.00 |
| 6 | $22.00 | $29.00 | $41.00 | $65.00 | $116.00 |
| 7 | $21.00 | $26.00 | $38.00 | $55.00 | $96.00 |
Key, lock and late payment fees
| Fee | Amount |
|---|---|
| Deposit per key issued | $6.00 |
| Key duplication or replacement (after first two keys), each | $14.00 |
| Lock replacement/late payment fee | $30.00 |
“No deposit for first two keys at Competitive locations”
Frequently asked questions
How much is a PO Box?
In Notice 123 the lowest PO Box fee is $21.00 for three months (Market Dominant, fee group 7, box size 1) and the highest is $677.00 for six months (Competitive, fee group C30, box size 5). The fee depends on the fee group of the Post Office, the box size and the term.
What are the PO Box fee groups?
Notice 123 prints Competitive fee groups C30 to C44 and Market Dominant fee groups 1 to 7, plus a Market Dominant group E with no fees listed. It says the ZIP Codes for Competitive locations and their assigned fee groups may be found at usps.com/manage/po-boxes.htm or your local Post Office. FedRateCalc does not map ZIP Codes to fee groups.
How much is the smallest PO Box for six months?
For box size 1 and a six-month term, Market Dominant fee groups 1 to 7 range from $31.00 to $81.00, and Competitive fee groups C30 to C44 range from $80.00 to $170.00.
Is a three-month PO Box cheaper than a six-month one?
Each term has its own fee. For Market Dominant fee group 1 and box size 1, three months is $50.00 and six months is $81.00, so two three-month terms ($100.00, arithmetic) cost more than one six-month term.
Are there extra fees for keys, locks and late payment?
Notice 123 lists $6.00 deposit per key issued, $14.00 for each key duplicated or replaced after the first two, and $30.00 for lock replacement or late payment. A footnote says there is no deposit for the first two keys at Competitive locations.
Related USPS fee pages
More USPS postage and fee tools
Sources
USPS Price List Notice 123, “Effective October 04, 2026”, sections “Domestic—Extra Services and Fees”, “Domestic—Other Services and Fees” and “Domestic—PO Box Service” (First-Class Mail postage from the same notice): https://pe.usps.com/text/dmm300/Notice123.htm. We checked the fees on this page against the Internet Archive copy of the notice captured October 22, 2026, and spot-checked the live page on November 2, 2026 (Certified Mail, Return Receipt, money orders, Registered Mail tiers and the PO Box rows for fee groups C30, C31 and C44 matched): https://web.archive.org/web/20261022140554id_/https://pe.usps.com/text/dmm300/Notice123.htm.
Reviewed November 2, 2026. Sums and multiples on this page (for example a fee plus postage) are arithmetic on the notice’s numbers and are labelled as such; Notice 123 does not print them. Check USPS.com or a Post Office before mailing.