Mark Patrick Nielsen Missing from San Luis Obispo County, California age 41

Case Description

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Mark Patrick Nielsen was 41 years old when he was last seen in San Luis Obispo County, California, on October 10, 1994. A resident of Los Osos, he has not been heard from since that day. His family officially reported him as a missing person on January 19, 1995, more than three months after his disappearance. There is limited information available regarding the circumstances of his case.

At the time he went missing, Nielsen was described as a White male with brown hair and blue eyes, st ...Read More
Last Seen: Oct 10, 1994

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Mark Patrick Nielsen - The Charley Project

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Victim Details

Created

Jan 24, 2026

Case Added

Jan 24, 2026

Firstname

Mark

Lastname

Patrick Nielsen

Current Age

41

Age At Disappearance

41

Height

5'8 inches

Weight

185 lbs

Ethnicity

White

Gender

Male

Notes

Nielsen was last seen in San Luis Obispo County, California on October 10, 1994. He lived in Los Osos. He has never been heard from again. Nielsen's family did not report him missing until January 19, 1995, three months after he was last seen. Few details are available in his case.

Last Seen

Oct 10, 1994

City

San Luis Obispo County

State

California

Zip Code

San Luis Obispo County

Vehicles

3

Agency Name

San Luis Obispo County Sheriff's Departmen

Agency Phone

805-781-4550

Last Updated

01/25/2026

Mark Patrick Nielsen
Missing

Case Description

Links to Additional Sources (4)

Victim Details

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