November 2000 Presidential Election:
Percentage of Ballots not Registering a Valid Vote for President

In descending order

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California County	Overvote/ Undervote	Voting System	Voting Machine
Colusa	3.2%	Punch Card	Datavote
Lake	3.0%	Optical Scan	DFM Mark-a-Vote
Los Angeles	2.7%	Punch Card	Votomatic
Mono	2.2%	Punch Card	Datavote
San Bernardino	2.0%	Punch Card	Pollstar
San Diego	2.0%	Punch Card	Votomatic
Modoc	2.0%	Punch Card	Datavote
Alpine	1.8%	Punch Card	Datavote
Santa Clara	1.8%	Punch Card	Pollstar
Imperial	1.7%	Punch Card	Datavote
Sutter	1.7%	Optical Scan	DFM Mark-a-Vote
Sacramento	1.7%	Punch Card	Pollstar
Mendocino	1.6%	Punch Card	Votomatic
Mariposa	1.5%	Optical Scan	ES&S Optech Eagle
Kings	1.5%	Punch Card	Datavote
Alameda	1.5%	Punch Card	Votomatic
Solano	1.5%	Punch Card	Votomatic
Plumas	1.3%	Punch Card	Datavote
Merced	1.3%	Optical Scan	ES&S 350/550
San Francisco	1.3%	Optical Scan	ES&S Optech Eagle
Shasta	1.3%	Punch Card	Votomatic
Glenn	1.2%	Punch Card	Datavote
Inyo	1.2%	Punch Card	Datavote
Tehama	1.1%	Punch Card	Datavote
Yuba	1.1%	Punch Card	Datavote
Del Norte	1.1%	Punch Card	Datavote
Trinity	1.1%	Optical Scan	Global Accu-Vote ES-2000
Nevada	1.0%	Optical Scan	ES&S 350/550
Monterey	1.0%	Punch Card	Datavote
Madera	1.0%	Optical Scan	DFM Mark-a-Vote
Amador	1.0%	Optical Scan	ES&S Optech Eagle
Sierra	1.0%	Punch Card	Datavote
Stanislaus	1.0%	Punch Card	Datavote
San Joaquin	0.9%	Optical Scan	DFM Mark-a-Vote
Riverside (Absentee)	0.9%	Optical Scan	DFM Mark-a-Vote
Kern	0.9%	Punch Card	Datavote
Siskiyou	0.9%	Punch Card	Datavote
Napa	0.9%	Punch Card	Datavote
Santa Cruz	0.8%	Optical Scan	DFM Mark-a-Vote
Yolo	0.8%	Punch Card	Datavote
Ventura	0.8%	Punch Card	Datavote
San Luis Obispo	0.8%	Optical Scan	Global Accu-Vote ES-2000
Tuolumne	0.8%	Optical Scan	ES&S 350/550
San Benito	0.8%	Punch Card	Datavote
Sonoma	0.8%	Optical Scan	DFM Mark-a-Vote
Orange	0.8%	Punch Card	Datavote
Humboldt	0.7%	Optical Scan	Global Accu-Vote ES-2000
Santa Barbara	0.7%	Optical Scan	Global Accu-Vote ES-2000
Contra Costa	0.7%	Optical Scan	DFM Mark-a-Vote
Tulare	0.7%	Optical Scan	Gloval Accu-Vote ES-2000
San Mateo	0.7%	Optical Scan	ES&S Optech Eagle
Fresno	0.7%	Optical Scan	Gloval Accu-Vote ES-2000
Lassen	0.6%	Punch Card	Datavote
Calaveras	0.6%	Punch Card	Datavote
El Dorado	0.6%	Punch Card	Datavote
Butte	0.6%	Optical Scan	DFM Mark-a-Vote
Riverside (polling place)	0.6% *	Touch Screen	Sequoia Pacific AVC Edge
Placer	0.5%	Optical Scan	ES&S Optech Eagle
Marin	0.4%	Optical Scan	Gloval Accu-Vote ES-2000
* Riverside County's Touch Screen system does not allow overvotes. This figure represents the percentage of voters who did not cast a vote for president. .
State Average	1.6%

CVF thanks the Assembly Committee on Elections, Reapportionment, and Constitutional Amendments, which included this data in a packet distributed at voting technology hearings held by the committee on January 16 and 17, 2001. Source data provided by the Office of the Secretary of State. All calculations were done by the Assembly Committee on Elections, Reapportionment, and Constitutional Amendments. Some systems used by counties for absentee or early voting programs differ from the polling place systems. Original chart adapted for the web by CVF.