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Right now, 2 researchers on YourRoots have John in their trees. The ancestor migration map traces 1 generations of this lineage.

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John McMahon 1812–1893

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.

A Reliability

Reliability Score: A

Strong — 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
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2 researchers on YourRoots have John McMahon in their family trees — each with their own records and documentation. Trace the migration path across 1 generations. If this ancestor is in your tree too, you can compare what you've found and fill in the gaps together.

Last updated: July 22, 2026 · Reliability: A — verified across 2 independent trees, with linked records

Born 22 FEB 1812 · Aghnamullen, Co Monaghan, Ire

Died 15 JUN 1893 · Coventry, Kent County, Rhode Island, United States of America

Father Constantine Mcmahon

Mother Mary Adams

Spouse Margaret Mcdonald

Children Anabella Mcmahon, Andrew Kirk Mcmahon, Eliza Jane Mcmahon, Ellen Mcmahon, John Henry Mcmahon, Margret Mcmahon, Mary , Sarah Ellen Mcmahon

Siblings Charles T Mcmahon, Eliza Anne Mcmahon, Henry Mcmahon Sr, James Mcmahon Sr, Margaret Mcmahon, Mary Jane Mcmahon, William Mcmahon

Records

1860 United States Federal Census 1870 United States Federal Census 1880 United States Federal Census U.S., Find a Grave® Index, … U.S., Naturalization Record Indexes, 1791-1992 … Rhode Island, U.S., Historical Cemetery … Rhode Island, U.S., State Censuses Rhode Island, U.S., Marriage Registrations … Rhode Island, U.S., State and … U.S., Family History Books

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Researchers connected through John McMahon 1812–1893

and 1 more tree owner connected with John McMahon 1812–1893

Immediate Family

Parents

Spouse(s)

Children

Biography

The story of John McMahon began in 1812 in Aghnamullen, Co Monaghan, Ire. John McMahon married margaret mcdonald, sarah kirk, and had children including anabella mcmahon, andrew kirk mcmahon, eliza jane mcmahon, ellen mcmahon, john henry mcmahon, margret mcmahon, mary, sarah ellen mcmahon. John McMahon passed away in 1893 in Coventry, Kent County, Rhode Island, United States of America.

Sources

1

Census 1860 United States Federal Census
2

Census 1870 United States Federal Census
3

Census 1880 United States Federal Census
4

Burial Records U.S., Find a Grave® Index, 1600s-Current
5

Naturalization U.S., Naturalization Record Indexes, 1791-1992 (Indexed in World Archives Project)
6

Burial Records Rhode Island, U.S., Historical Cemetery Commission Index
7

Record Rhode Island, U.S., State Censuses
8

Record Rhode Island, U.S., Marriage Registrations 1853 -1922
9

Record Rhode Island, U.S., State and Federal Naturalization Records, 1802-1945
10

Record U.S., Family History Books

Life Timeline

1812

Birth of John McMahon in Aughnamullen, Co. Monaghan, Ireland

Birth

1812

Birth of John McMahon in Aghnamullen, Co Monaghan, Ire

Birth

1855

John McMahon - Naturalization

Naturalization

1860

John McMahon resided here in Scituate, North Scituate, Providence, Rhode Island, USA

Residence

1870

John McMahon resided here in Warwick, Phenix, Kent, Rhode Island, USA

Residence

1875

John McMahon resided here in Warwick, Kent, Rhode Island, USA

Residence

1880

John McMahon resided here in Warwick, Kent, Rhode Island, USA

Residence

1893

Death of John McMahon in Phenix, Kent, RI

Death

1893

Death of John McMahon in Phenix, Kent, RI

Death

Oldest Ancestor Line from John McMahon

Direct Lineage

generations

Frequently Asked Questions

: John McMahon (1812–1893) was born in Aghnamullen, Co Monaghan, Ire and died in Coventry, Kent County, Rhode Island, United States of America. 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 (A) based on cross-tree validation.
: Right now, 2 researchers on YourRoots have John 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 1 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.