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John Mcdermott — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Linn-County, Iowa
Our Model Tree links this John Mcdermott across the 1920, 1930 and 1940 US Censuses in Linn-County, Iowa (XGBoost, ~Confirmed) — first a head (b.~1871), then head of a 3-person household.
Age 69
b. ~1871
Male
Head
Born: Ireland
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Linn-County, Iowa |
| Surname | McDermott |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 69 |
| Marital Status | Married |
| Birthplace | Ireland |
| 1935 Residence (City) | Cedar Rapids |
| 1935 Residence (County) | Linn |
| Naturalization Status | Naturalized |
| Additional Details | |
| Occupation | Fireman |
| Industry | Theater |
| Class of Worker | PW |
| Hours Worked | 72 |
| Income (1939) | 1200 |
| Highest Grade | G 8 |
| 1935 Residence | Same House |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
| Occupation | Fireman |
| Township / Ward | Cedar Rapids |
| Est. Birth Year | ~1871 |
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 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| John Mcdermott | Head | — | 69 | ~1871 |
| Donald Mcdermott | Son | — | 22 | ~1918 |
| Mary Mcdermott | Spouse | — | 60 | ~1880 |
Census Appearances
1920
Linn, Iowa
Head, age 49
Linn, Iowa · implied b. ~1871 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McDermott |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 49 |
| Marital Status | Married |
| Birthplace | Ireland |
| Year of Immigration | 1890 |
| Naturalization Status | Naturalized |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Fireman |
| Industry | City |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Home Owned/Rented | R |
| Birth Country | Ireland |
| Year of Naturalization | 1895 |
| Birthplace (normalized) | ireland |
1930
Linn, Iowa
Head, age 59
Linn, Iowa · implied b. ~1871 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McDermott |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 59 |
| Marital Status | Married |
| Birthplace | Ireland |
| Naturalization Status | Naturalized |
| Year of Immigration | 1890 |
| Age at First Marriage | 24 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Policeman |
| Industry | City Police Dept |
| Class of Worker | W |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Home Owned/Rented | R |
| Home Value / Rent | 45 |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
1940
Linn-County, Iowa
Head, age 69
Linn-County, Iowa · implied b. ~1871 — 3 household members
| Surname | McDermott |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 69 |
| Marital Status | Married |
| Birthplace | Ireland |
| 1935 Residence (City) | Cedar Rapids |
| 1935 Residence (County) | Linn |
| Naturalization Status | Naturalized |
| Occupation | Fireman |
| Industry | Theater |
| Class of Worker | PW |
| Hours Worked | 72 |
| Income (1939) | 1200 |
| Highest Grade | G 8 |
| 1935 Residence | Same House |
| 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 John Mcdermott across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
John Mcdermott
Head · 1940 · age 69 · b. ~1871 · Iowa
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Linn-County, Iowa
Open full size
1940 US Federal Census — Linn-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01177-00252)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | John R. Sanborn | 22 | Son | Collector | Iowa |
| 42 | Edna K. Sanborn | 23 | Daughter | Saleslady | Iowa |
| 43 | Robert D. Conley | 23 | Son | Machinist | Iowa |
| 44 | Lorene Conley | 20 | Daughter | Salesman | Iowa |
| 45 | Theodore H. Parsons | 36 | Head | Salesman | Iowa |
| 46 | Leda Parsons | 34 | Wife | — | Iowa |
| 47 | Ronald Parsons | 12 | Son | — | Iowa |
| 48 | Joan Parsons | 9 | Daughter | — | Iowa |
| 49 | Edward Leigh | 60 | Head | — | England |
| 50 | Ellen Leigh | 66 | Wife | — | England |
| 51 | Extra Line Leigh | None | — | — | — |
| 52 | Extra Line Leigh | None | — | — | — |
| 53 | John Mcdermott THIS PERSON | 69 | Head | Fireman | Ireland |
| 54 | Mary Mcdermott | 60 | Wife | — | Illinois |
| 55 | Donald Mcdermott | 22 | Son | Shipping Clerk | Iowa |
| 56 | Agnes Kress | 35 | Head | Stenographer | Iowa |
| 57 | Nancy Gibbons | 24 | Partner | Librarian | Wisconsin |
| 58 | Barney Lodge | 46 | Head | Desk Clerk | Iowa |
| 59 | Gladys Lodge | 42 | Wife | — | Iowa |
| 60 | Mary H. Lodge | 14 | Daughter | — | Iowa |
| 61 | Gayle R. Lodge | 12 | Daughter | — | Iowa |
| 62 | Helen L. Lodge | 6 | Daughter | — | Iowa |
| 63 | Daniel B. Lodge | 5 | Son | — | Iowa |
| 64 | Marie A. Lodge | 3 | Daughter | — | Iowa |
| 65 | Kathryn Greer | 51 | Head | — | Iowa |
| 66 | Dick Wise | 31 | Head | Truck Driver | Iowa |
| 67 | Doris Wise | 29 | Wife | Stenographer | Iowa |
| 68 | Extra Line Wise | None | — | — | — |
| 69 | Jesse E. Barnett | 67 | Head | Lightweighting|Nightwatchman | Pennsylvania |
| 70 | Mary A. Barnett | 60 | Wife | — | Iowa |
| 71 | Mary A. Barnett | 21 | Daughter | New Worker | Iowa |
| 72 | Arthur J. Rock | 43 | Head | Salesman | Iowa |
| 73 | Ellen Rock | 40 | Wife | — | Iowa |
| 74 | June Rock | 19 | Daughter | New Worker | Iowa |
| 75 | Bobbie Rock | 11 | Son | — | Iowa |
| 76 | Catherine Milligan | 34 | Sister-in-law | Private Secretary | Iowa |
| 77 | Jack Mye | 22 | Head | Musician | Iowa |
| 78 | Eileen Mye | 24 | Wife | Musician | South Dakota |
| 79 | Dale Mccoy | 26 | Head | Transmitter Building|Engineer | Iowa |
| 80 | Ila Mccoy | 26 | Wife | — | Iowa |
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1940 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)