YourRoots by Genomelink
banner

Sign up to explore more

Create a free account to navigate family trees, view ancestors, and discover connections.

Mark W O'Brien 1900–1969 – Genealogical Records

Birth Date: abt 1900

Birth Location: Connecticut

Death Date: 3 Oct 1969

Death Location: Stamford, Fairfield, Connecticut, USA

Father: John O'Brien

Mother: Annie O'Brien

Spouse(s):

Children(s):

In 1900, Mark W O'Brien entered the world in Connecticut, born to John J O Brien And Annie E O Brien. In 1910, Mark W O'Brien resided in Stamford Ward 4, Fairfield, Connecticut, USA. In 1917, Mark W O'Brien resided in Stamford, Connecticut. Mark W O'Brien passed away in 1969 in Stamford, Fairfield, Connecticut, USA.

Find more search results for Mark O'Brien
MO

Reliability Score

This score reflects the reliability of the source family tree. A high rating indicates a trustworthy source with strong data consistency.

Reliability Score:
A
Criteria:
  • A 3 criteria (Strong)
  • B 2 criteria (Medium)
  • C 1 criteria (Basic)
  • N/A 0 criteria (Insufficient)

This tree's reliability score:

  • Record available
  • Descendant's record available
  • Star tree owner

Biography

  • In 1900, Mark W O'Brien entered the world in Connecticut, born to John J O Brien And Annie E O Brien.
  • In 1910, Mark W O'Brien resided in Stamford Ward 4, Fairfield, Connecticut, USA.
  • In 1917, Mark W O'Brien resided in Stamford, Connecticut.
  • Mark W O'Brien passed away in 1969 in Stamford, Fairfield, Connecticut, USA.

Immediate Family

Parents

Spouses(s)

Children(s)

Mark O'Brien's Ancestors

Self
Mark O'Brien
1900–1969
Birth Place: Connecticut
Parents
John J O'Brien
1868–1931
Saint Peter-catholic, Jersey City, Hudson, New Jersey
Annie (E) O'Brien
1871–1942
Connecticut
Grandparents
Matthew O'Brien
1835–1887
Co Wexford, Ireland
Mary (Lennard) O'Brien
1846–1904
Ireland
Great-Grandparents
2nd-Great-Grandparents

Mark O'Brien's Timeline

5 Records

1900
abt 1900
Birth of Mark W O'Brien in Connecticut
Connecticut
1910
1910
Age 10
Mark W O'Brien resided here in Stamford Ward 4, Fairfield, Connecticut, USA
Stamford Ward 4, Fairfield, Connecticut, USA
1917
1917
Age 17
Mark W O'Brien resided here in Stamford, Connecticut
Stamford, Connecticut
1920
1920
Age 20
Mark W O'Brien resided here in Stamford Ward 4, Fairfield, Connecticut, USA
Stamford Ward 4, Fairfield, Connecticut, USA
1969
3 Oct 1969
Age 69
Death of Mark W O'Brien in Stamford, Fairfield, Connecticut, USA
Stamford, Fairfield, Connecticut, USA

Sources

    Genealogy Event 1
    Event Type: Birth
    Event Date: abt 1900
    Event Place: Connecticut
    Record Source:
    [1] Connecticut, Military Census, 1917
    [2] 1920 United States Federal Census, Year: 1920; Census Place: Stamford Ward 4, Fairfield, Connecticut; Roll: T625_179; Page: 16B; Enumeration District: 172
    [3] 1910 United States Federal Census, Year: 1910; Census Place: Stamford Ward 4, Fairfield, Connecticut; Roll: T624_130; Page: 15B; Enumeration District: 0118; FHL microfilm: 1374143

    Genealogy Event 2
    Event Type: Residence
    Event Date: 1910
    Event Place: Stamford Ward 4, Fairfield, Connecticut, USA
    Record Source: 1910 United States Federal Census, Year: 1910; Census Place: Stamford Ward 4, Fairfield, Connecticut; Roll: T624_130; Page: 15B; Enumeration District: 0118; FHL microfilm: 1374143

    Genealogy Event 3
    Event Type: Residence
    Event Date: 1917
    Event Place: Stamford, Connecticut
    Record Source: Connecticut, Military Census, 1917

    Genealogy Event 4
    Event Type: Residence
    Event Date: 1920
    Event Place: Stamford Ward 4, Fairfield, Connecticut, USA
    Record Source: 1920 United States Federal Census, Year: 1920; Census Place: Stamford Ward 4, Fairfield, Connecticut; Roll: T625_179; Page: 16B; Enumeration District: 172

    Genealogy Event 5
    Event Type: Death
    Event Date: 3 Oct 1969
    Event Place: Stamford, Fairfield, Connecticut, USA

About YourRoots

Family Tree Map

Explore your family tree geographically

Import your GEDCOM file to transform your family tree into an interactive global map. See your roots laid out visually and understand your true geographic heritage.

Powerful tools like "Trace Back To Me" instantly map your family's migration paths from a chosen ancestor all the way back to you.

LEARN MORE
AI Genealogy Research

Discover ancestors beyond "end-of-line" automatically

Import your family tree and let AI expand it for you. AI Ancestor Finder scans "end-of-line" ancestors to uncover their parents across hundreds of family lines at once. AI Deep Research analyzes selected ancestors and family clusters, suggesting relevant records and next steps.

Turn on Auto Research Mode to get new discoveries daily or weekly, so your tree keeps growing even while you're away.

LEARN MORE
DNA Match

Find more DNA matches across all DNA tests

Combine your DNA data with your family tree to unlock the full power of YourRoots DNA Match. Connect with relatives across major testing services — Ancestry, 23andMe, MyHeritage, and more.

View your matches' maps and trees to identify shared ancestors, and soon you'll be able to add them directly to your own tree and map.

LEARN MORE
Ancestry Reports

Ancestry DNA analysis that goes deeper than others

Unlock exclusive reports that reveal your deeper origins.

  • Deep Ancestry Report — Analyze 130+ ethnicities, sub-regions, and 1,800+ communities in one detailed view.
  • Global & Native American Reports — Developed with Stanford researchers to uncover hidden ancestries across all 22 chromosomes.
  • Ancient DNA Series — Compare your DNA with 1,000+ ancient genomes from Viking, Celtic, and early American civilizations.
LEARN MORE