High Programmer > Alan De Smet > Unique ID > Washington Driver's License Numbers

Washington Driver's License Numbers

by Alan De Smet

You might want to look at my disclaimer before using this information for anything important. You might want to see warning about fake ids before using this information to make a fake id.

I have an online program than can calculate Washington driver's license numbers. Or you can download a copy of the software.

Washington state encodes your last name, first and middle initial, and your date of birth in your driver's license number. These license numbers look like the following:

LLLLLFMYYXmb
WOO**JT547KA
WALKECR577DU

The above licenses are for "John T. Woo," born on May 1st, 1946, and "Christopher R. Walken," born on March 31st, 1943

LLLLL - Last Name, truncated - The first five characters are the first five letters of the last name. If the name is shorter than five characters, the extra space is padded with asterisks (*).

F - First Initial

M - Middle Initial

YY - Year of birth, encoded - This is 100 minus the the two digit year of birth. So someone born in 1998 will be 2 (100-98), as will someone born in 1898. I assume if the birth year is a 1900 or 2000 that the result is 00, not 100, but I don't know.

X - Checksum - This cannot be calculated until you know the rest of the license.

Once you have all of the rest of the license characters the following equation will determine the checksum. a1 is the first character (the first letter of the last name), a2 is the second letter, and so on.

checksum = (a1 - a2 + a3 - a4 + a5 - a6 + a7 - a8 + a9 - a11 + a12) mod 10;

For non digits, you can find the number to use in the equation here:

*4
A1
B2
C3
D4
E5
F6
G7
H8
I9
J1
K2
L3
M4
N5
O6
P7
Q8
R9
S2
T3
U4
V5
W6
X7
Y8
Z9

m - Month of birth, encoded. Look up your birth month on this table. There are two options. In general the state will use the first column. If another person has generated the same license number as you, they'll use the second column. (I have no idea what they do after that.)

Jan 1BS
Feb 2CT
Mar 3DU
Apr 4J1
May 5K2
Jun 6L3
Jul 7M4
Aug 8N5
Sep 9O6
Oct 10P7
Nov 11Q8
Dec 12R9

d - Day of month of birth, encoded - Look up the code for your birth's day of month.

1A
2B
3C
4D
5E
6F
7G
8H
9Z
10S
11J
12K
13L
14M
15N
16W
17P
18Q
19R
200
211
222
233
244
255
262
277
288
299
30T
31U

Much of this information (notably the tables for birth day encoding and the checksum algorithm) was derived from Mathematics and Writing in Action.

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