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Margaret Mcmahon — 1930 US Census Record
Model Tree available1930 United States Federal Census · Cook, Illinois
Our Model Tree links this Margaret Mcmahon across the 1920, 1930 and 1940 US Censuses in Cook, Illinois (XGBoost, ~Confirmed), with identified parents Johanna — first a head (b.~1874), then head of a 3-person household.
Age 56
b. ~1874
Female
Head
Born: Ireland
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Cook, Illinois |
| Surname | McMahon |
| Given Name | Margaret |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 56 |
| Marital Status | Single |
| Birthplace | Ireland |
| Naturalization Status | Naturalized |
| Year of Immigration | 1898 |
| Age at First Marriage | 27 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Additional Details | |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Home Owned/Rented | R |
| Home Value / Rent | 55 |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1874 |
Household Members
Census records only state relationship to the household head.
Pairwise kinship is derived (~90–95% accurate), not recorded.
Step/blended families and boarders can break it.
3 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to Margaret | Age | Birth yr |
|---|---|---|---|---|
| James Mcmahon | Son | — | 23 | ~1907 |
| Margaret Mcmahon | Head | — | 56 | ~1874 |
| Catherine Mcmahon | Daughter | — | 18 | ~1912 |
Census Appearances
1920
Cook, Illinois
Daughter, age 45
Cook, Illinois · implied b. ~1875 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMahon |
| Given Name | Maggie |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 45 |
| Marital Status | Single |
| Birthplace | Ireland |
| Year of Immigration | 1884 |
| Naturalization Status | Naturalized |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
1930
Cook, Illinois
Head, age 56
Cook, Illinois · implied b. ~1874 — 3 household members
| Surname | McMahon |
| Given Name | Margaret |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 56 |
| Marital Status | Single |
| Birthplace | Ireland |
| Naturalization Status | Naturalized |
| Year of Immigration | 1898 |
| Age at First Marriage | 27 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Home Owned/Rented | R |
| Home Value / Rent | 55 |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
1940
Cook-County, Illinois
Spouse, age 62
Cook-County, Illinois · implied b. ~1878 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMahon |
| Given Name | Margaret |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 62 |
| Marital Status | Married |
| Birthplace | Ireland |
| 1935 Residence (City) | CHICAGO CITY |
| 1935 Residence (County) | COOK |
| Naturalization Status | Naturalized |
| Income (1939) | 0 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
Model Tree
An inferred pedigree reconstructed from census links — up to 4 generations within the 1900–1950 window. Closer generations are built from household co-residence; deeper ones are bridged by following a relative to their own childhood census. Confidence compounds and weakens with each generation.
Our Model Tree links Margaret Mcmahon across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: mother Johanna Mcmahon (~0.92 confidence). The pedigree spans 1 generation with 1 identified ancestor.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Johanna Mcmahon
b. ~1861
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Margaret Mcmahon
Head · 1930 · age 56 · b. ~1874 · Illinois
★ You are viewing this record
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1930 US Federal Census — Cook, Illinois
Open full size
1930 US Federal Census — Cook, Illinois
Page Contents
50 people indexed on this census page (ia:1930:illinoiscensus00reel462:0310)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Nellie M Munro | 64 | Head | — | Scotland |
| 2 | John Ryburn | 29 | Roomer | Electrical Operator | Missouri |
| 3 | Eugene Powell | 28 | Roomer | Electrical | Illinois |
| 4 | William H Fort | 62 | Head | Proprietor | Illinois |
| 5 | Gertrude Fort | 68 | Wife | — | Kentucky |
| 6 | William H Seyfried | 50 | Head | Wood Finisher | Illinois |
| 7 | Emma Seyfried | 45 | Sister | — | Illinois |
| 8 | Elizabeth Penshorn | 38 | Sister | Milliner | Illinois |
| 9 | Lena Seffer | 72 | Head | — | Illinois |
| 10 | Lena Seffer | 50 | Daughter | Saleslady | Illinois |
| 11 | Mary Seffer | 48 | Daughter | — | Illinois |
| 12 | William A Seffer | 43 | Son | Elevator Operator | Illinois |
| 13 | Rose Seffer | 38 | Daughter | Bookkeeper | Illinois |
| 14 | Loretta Seffer | 36 | Daughter | Bookkeeper | Illinois |
| 15 | Rosanna Dillon | 41 | Head | — | Illinois |
| 16 | Cora Dillon | 23 | Daughter | Stencil Cutter | Illinois |
| 17 | Lawrence Dillon | 22 | Son | Rent Collector | Illinois |
| 18 | William P Dillon | 32 | Brother | General Work | Illinois |
| 19 | Rosanna Dillon | 20 | Daughter | Stencil Cutter | Illinois |
| 20 | John Bourke | 61 | Head | Proprietor | New Jersey |
| 21 | Alice Bourke | 56 | Wife | — | Illinois |
| 22 | Ruth Bourke | 24 | Daughter | — | Illinois |
| 23 | Billy Bourke | 19 | Daughter | — | Illinois |
| 24 | Janet Bourke | 15 | Daughter | — | Illinois |
| 25 | Carl Price | 32 | Son-in-law | Salesman | Illinois |
| 26 | Harry Price | 12 | Grandson | — | Illinois |
| 27 | Morrison Hornbeck | 25 | Head | Tracer | Kansas |
| 28 | Marybeth Hornbeck | 28 | Wife | — | Illinois |
| 29 | Gerald Morrison | 25 | Brother-in-law | Salesman | Oklahoma |
| 30 | Claren Crossley | 31 | Head | — | Massachusetts |
| 31 | Augusta Crossley | 24 | Wife | — | New York |
| 32 | Helen Buckey | 21 | Sister-in-law | Beauty Operator | Illinois |
| 33 | John Smith | 60 | Head | Brick Mason | Illinois |
| 34 | Delia Smith | 59 | Wife | Cash Inspector | New York |
| 35 | Loretta Hitchcock | 34 | Sister-in-law | — | Illinois |
| 36 | John Martin | 23 | Head | Laborer | Ireland |
| 37 | Bridie Martin | 23 | Wife | — | Ireland |
| 38 | Christopher Joyce | 21 | Brother-in-law | Policeman | Ireland |
| 39 | Michael Conway | 31 | Boarder | Policeman | Ireland |
| 40 | Catherine Conway | 28 | Boarder | — | Ireland |
| 41 | Anna Smith | 56 | Head | — | Ohio |
| 42 | Wilfred Smith | 37 | Son | Pressman | Ohio |
| 43 | Richard Smith | 26 | Son | Pressfeeder | Ohio |
| 44 | Adeline Smith | 31 | Daughter | Clerical | Ohio |
| 45 | June Certy | 14 | Granddaughter | — | Illinois |
| 46 | Mary Flynn | 77 | Mother | — | Ireland |
| 47 | Margaret Mcmahon THIS PERSON | 56 | Head | — | Ireland |
| 48 | Catherine Mcmahon | 18 | Daughter | Stenographer | Illinois |
| 49 | James Mcmahon | 23 | Son | Clerical | Illinois |
| 50 | <End> | None | — | — | — |
Pedigree Summary
Margaret
Gen 1 · 1 parents
~0.92
Max depth 4 (1900–1950 window)
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1930 United States Federal Census (NARA). Our Model Tree links this person across census decades using XGBoost-based record linkage, with per-link confidence scores. Household corroboration strengthens the signal when co-residents appear on the same census pages in multiple years.
Source: National Archives and Records Administration (NARA)