Surfing the web I just happened upon this: Online voter registration form for San Diego County, CA.

Are you a U.S. citizen?
Just say YES!

Yes No (If no, don't fill out this form.)
Hint: Never check NO!

Will you be at least 18 years of age on or before election day?
Yes No (If no, don't fill out this form.)

Indicate your preferred title:
Mr. Mrs. Miss Ms.
Last Name:

First Name:

Middle Name:

Address where you liveNumber, Street, Ave., Road,
Including N, S, E, W, NO PO BOX/BUSINESS ADDRESS): Apt. #:

City:
State:
CA
Zip Code:

County
San Diego

If no street address,describe where you live:
(Cross Streets, Route, Section, Range, N, S, E, W):
Mailing Address(if different from the address where you live, or PO BOX):

City
(or APO/FPO): State:
Zip:
Foreign Country:
Date of Birth
(Month/Day/Year)
Place of Birth: -
(State or Country Only)

CA driver's license
or CA ID card #

SSN
(last 4 digits)
(It's important you remember these four digits and if ever asked for them again on any other application you should use the same four digits,)

Telephone: (optional)
( ) -

E-mail: (optional)
Political Party-Select One
American Independent Party Democratic Party
Green Party Libertarian Party
Peace & Freedom Party Republican Party
I Decline to State A Political Party
Other (Specify)

To receive a vote-by-mail ballot in all elections, enter initials here:
Have you ever been registered to vote? No Yes
If Yes, give information from last voter registration form, including political party.
Last Name:

First Name:

MI:

Street Address:
City:
State:
Zip Code:
County:
Prior Political Party:

Enter Your Ethnic Background (Optional)
(specify)
Please Check Your Language Preference
English Spanish
Filipino Vietnamese

Can you help in the following areas? (Optional)
Provide a Polling Place Site Polling Place Worker
Bilingual Polling Place Worker


Instructions:

Mr., Mrs., Miss, Ms.:Prefix to name is optional.

ADDRESS WHERE YOU LIVE: This must be your California residence and domicile. You may not use your business, mailing or secondary address. No PO BOX

CA DRIVER'S LICENSE OR CA ID CARD NUMBER: When you register to vote you must provide your California driver's license or California identification number, if you have one. If you do not have a driver's license or ID card, you must provide the last four digits of your Social Security Number (SSN). If you do not include this information you will be required to provide identification when you vote. (You've been warned to remember those 4 digits so don't muck it up now.)

TELEPHONE: Please include area code. This will help elections officials contact you and is posted in precincts on election day. (Optional)

E-MAIL ADDRESS: No person shall be denied the right to register to vote for failure to furnish an e-mail address. The Secretary of State's Office will not use your e-mail address for any other purpose than confirming this request for a voter registration form. However, please be advised that local county elections officials are required to provide voter registration information, which can include an e-mail address, to entities, individuals or organizations for governmental, political and scholastic purposes. (Optional)

POLITICAL PARTY: Ensure you have selected a qualified political party, or "I Decline to State a Political Party" or "Other". If you mark "Other," you may print the name of an unqualified political party. No person shall be entitled to vote the ballot of any political party unless he or she has registered with that party. However, if a voter has declined to state a political party affiliation, and the political party permits it, the unaffiliated voter may vote in the party's primary election.

IF YOU HAVE BEEN REGISTERED TO VOTE: Please complete all information in this section, including political party. If you do not complete all the information it may delay your registration. (Don't let this scare you, we need your vote!)

PERMANENT ABSENTEE VOTER: State law now allows any voter, who so requests, to be a permanent absentee voter. Once enrolled you will automatically receive an absentee ballot for every election in which you are entitled to vote. Failure to vote in a statewide election, however, will cancel your Permanent absentee status (not your voter registration) and you will need to reapply for permanent status.

The six qualified political parties in California are American Independent, Democratic, Green, Libertarian, Peace & Freedom, and Republican.

WARNING: It is illegal to register to vote if you are not eligible or to fraudulently register other persons. Punishable by up to three years in prison.
(Don't let this scare you because there is never any verification of information provided by an applicant.)

https://www.sdvote.org/abc2pdf/Evotereg.asp

All comments in red are my own sarcastic remarks!