Mary Hayes (1849–1902) was born in Cambridge, Middlesex, Massachusetts, USA and died in Cambridge, Middlesex, Massachusetts, United States. 2 researchers on YourRoots have this ancestor in their family trees.

How many people are researching Mary?

Right now, 2 researchers on YourRoots have Mary in their trees. The ancestor migration map traces 4 generations of this lineage.

What records do they have for Mary?

Records vary by researcher and can include census, vital, parish, cemetery, and family sources.

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Use Compare Tree on an available researcher profile to compare overlapping people and records.

Mary A (Mary Elizabeth) Hayes 1849–1902

Public Tree Person

What is a Public Tree Person?

A Public Tree Person is an ancestor documented independently by multiple YourRoots tree owners. When several researchers' family histories converge on the same person, we publish a shared page that combines what they've documented.

Why this is a Public Tree Person

Full name consistent across 2 independent trees

Birth year and location consistent across 2 trees

Death year and location consistent across 2 trees

Compare a Public Tree Person with your own tree using Compare Tree.

B Reliability

Reliability Score: B

Medium — based on the source tree

Grade scale

A 3 criteria (Strong)
B 2 criteria (Medium)
C 1 criteria (Basic)

Verification checklist

Record available
Descendant's record available
Star tree owner

2 researchers on YourRoots have Mary Hayes in their family trees — each with their own records and documentation. Trace the migration path across 4 generations. If this ancestor is in your tree too, you can compare what you've found and fill in the gaps together.

Last updated: August 25, 2026 · Reliability: B — verified across 2 independent trees, with linked records

Born 12 Sep 1849 · Cambridge, Middlesex, Massachusetts, USA

Died 1 Dec 1902 · Cambridge, Middlesex, Massachusetts, United States

Father Daniel Hayes

Mother Anne Oconnell

Siblings Catherine C Hayes, Daniel J Hayes, Dennis Joseph Hayes, Ellen M Hayes, Jeremiah Hayes, Joanna Hayes

Records

1880 United States Federal Census

Compare Tree

Researchers connected through Mary Hayes 1849–1902

and 1 more tree owner connected with Mary Hayes 1849–1902

Immediate Family

Parents

Daniel Hayes

Anne Oconnell

Spouse(s)

No spouse recorded

Children

No children recorded

Biography

In 1849, Mary A (Mary Elizabeth) Hayes entered the world in Cambridge, Middlesex, Massachusetts, USA, born to daniel hayes and anne oconnell. In 1880, Mary A (Mary Elizabeth) Hayes resided in Cambridge, Middlesex, Massachusetts, USA. Mary A (Mary Elizabeth) Hayes passed away in 1902 in Cambridge, Middlesex, Massachusetts, United States.

Sources

1

Census 1880 United States Federal Census

Life Timeline

1849

Birth of Mary A (Mary Elizabeth) Hayes in Cambridge, Middlesex, Massachusetts, USA

Birth

1880

Mary A (Mary Elizabeth) Hayes resided here in Cambridge, Middlesex, Massachusetts, USA

Residence

1902

Death of Mary A (Mary Elizabeth) Hayes in Cambridge, Middlesex, Massachusetts, United States

Death

Oldest Ancestor Line from Mary Hayes

This ancestor line traces from Mallow, Cork, Ireland (1745) to Cambridge, Middlesex, Massachusetts, USA (1849) across 4 generations.

Direct Lineage

generations

Frequently Asked Questions

: Mary Hayes (1849–1902) was born in Cambridge, Middlesex, Massachusetts, USA and died in Cambridge, Middlesex, Massachusetts, United States. 2 researchers on YourRoots have this ancestor in their family trees, each with their own records. This page combines what they've independently documented and assigns a Reliability Score (B) based on cross-tree validation.
: Right now, 2 researchers on YourRoots have Mary in their trees. They're working independently, so connecting with them is a good way to cross-check your records and find things you might have missed. You can also explore the ancestor migration map that traces 4 generations of this lineage geographically.
: It varies by researcher — some have census records, others have marriage certificates, parish registers, or family Bible entries. Scroll up to see exactly what each person has cited.
: Use the "Compare Tree" button on any researcher's profile above. You can compare your tree side by side with theirs, see where your records overlap or differ, and collaborate to fill gaps.