Types of Mailboxes

There are three sizes of typical mailboxes as indicated in Table 9-1. The dimensions for the large mailbox represent the maximum size allowed for a typical mailbox.
Table 9-2 shows the dimensions for a lockable architectural mailbox.
Typical Mailbox Sizes
Size
Typical Dimensions (inches)
Maximum Weight (pounds)
1
Length
Width
Height
Small
19 ½
6
7
5
Medium
22 ½
8
11 ½
7
Large
23 ½
11 ½
13 ½
10
1
Excluding molded plastic on a 4 x 4 post
Table 9-2: Lockable Architectural Mailbox Size
View/Size in Inches
View:
Top
Bottom
Front Side
Back Side
Weight(in lbs)
Side
18
15
18.3
15
22.4
Back
11.5
11.5
NA
15
Mailboxes shall be constructed of lightweight sheet metal or lightweight plastic material. Heavy steel, cast iron, or decorative mailboxes shall not be used on the state highway system. Field crews that are uncertain about whether a mailbox meets the criteria should contact the Maintenance Division. Section 7 in this chapter provides an example letter that can be provided to residents who have a mailbox that does not meet TxDOT criteria.