JC
John Cavanaugh — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Montgomery-County, Maryland
Our Model Tree links this John Cavanaugh across the 1930 and 1940 US Censuses in Montgomery-County, Maryland (XGBoost, ~Confirmed) — first a son (b.~1925), then head of a 11-person household.
Age 15
b. ~1925
Male
Son
Born: Maryland
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Montgomery-County, Maryland |
| Surname | Cavanaugh |
| Given Name | John |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | Takoma Park |
| 1935 Residence (County) | Montgomery |
| Additional Details | |
| Highest Grade | H-1 |
| 1935 Residence | Same house |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Township / Ward | Takoma Park |
| Est. Birth Year | ~1925 |
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.
11 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Jean Cavanaugh | Daughter | — | 16 | ~1924 |
| Leo Cavanaugh | Son | — | 12 | ~1928 |
| Helen Cavanaugh | Daughter | — | 23 | ~1917 |
| Betty Cavanaugh | Daughter | — | 18 | ~1922 |
| Elizabeth Demille | Other | — | 6 | ~1934 |
| Frances Cavanaugh | Daughter | — | 14 | ~1926 |
| Anne Demille | Daughter | — | 25 | ~1915 |
| Leo Cavanaugh | Head | — | 51 | ~1889 |
| May Cavanaugh | Spouse | — | 51 | ~1889 |
| John Cavanaugh | Son | — | 15 | ~1925 |
| Robert Demille | Other | — | 4 | ~1936 |
Census Appearances
1930
Montgomery, Maryland
Son, age 5
Montgomery, Maryland · implied b. ~1925 — 11 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cavanaugh |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 5 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Virginia |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1940
Montgomery-County, Maryland
Son, age 15
Montgomery-County, Maryland · implied b. ~1925 — 11 household members
| Surname | Cavanaugh |
| Given Name | John |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | Takoma Park |
| 1935 Residence (County) | Montgomery |
| Highest Grade | H-1 |
| 1935 Residence | Same house |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
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 Cavanaugh across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Cavanaugh
Son · 1940 · age 15 · b. ~1925 · Maryland
★ You are viewing this record
Sibling
Anne Demille
Sibling · 1940 · age 25
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Betty Cavanaugh
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Frances Cavanaugh
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helen Cavanaugh
Sibling · 1940 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Leo Cavanaugh
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Jean Cavanaugh
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Montgomery-County, Maryland
Open full size
1940 US Federal Census — Montgomery-County, Maryland
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01555-00196)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Sara E. Holmes | 19 | niece | Billing Clerk | Conn. |
| 2 | Melvin Mcbride | 25 | head | Fireman | Ohio |
| 3 | Millie Mcbride | 25 | wife | — | Maryland |
| 4 | Paul R. Mcbride | 2 | son | — | Maryland |
| 5 | Melva L. Mcbride | 1 | daughter | — | Maryland |
| 6 | Baron D. Mcbride | 24 | brother | Repairman | Ohio |
| 7 | Kindell Kitt | 28 | lodger | Super-Cargo | Maryland |
| 8 | Leo Cavanaugh | 51 | head | Medical Examiner | Maryland |
| 9 | May Cavanaugh | 51 | wife | — | Virginia |
| 10 | Helen Cavanaugh | 23 | daughter | Secretary | Maryland |
| 11 | Betty Cavanaugh | 18 | daughter | Typist | Maryland |
| 12 | Jean Cavanaugh | 16 | daughter | — | D.C. |
| 13 | John Cavanaugh THIS PERSON | 15 | son | — | Maryland |
| 14 | Frances Cavanaugh | 14 | daughter | — | D.C. |
| 15 | Leo Cavanaugh | 12 | son | — | D.C. |
| 16 | Anne Demille | 25 | daughter | — | Maryland |
| 17 | Elizabeth Demille | 6 | granddaughter | — | Virginia |
| 18 | Robert Demille | 4 | grandson | — | D.C. |
| 19 | William A. Tabor | 31 | head | Plumber | Virginia |
| 20 | Katherine Tabor | 33 | wife | Clerk | Georgia |
| 21 | Richard Tabor | 8 | son | — | Maryland |
| 22 | David Ranley | 30 | head | Physician | Colorado |
| 23 | Margaret G. Ranley | 25 | wife | — | Colorado |
| 24 | Lois Ranley | 2 | daughter | — | Texas |
| 25 | John Seate | 30 | head | Clerk | Texas |
| 26 | Gwen Seate | 25 | wife | Photo | Missouri |
| 27 | Donald Davies | 30 | head | Laborer | Nebraska |
| 28 | Eva Davies | 30 | wife | — | Virginia |
| 29 | George E. Davies | 1 | son | — | D.C. |
| 30 | Robert L. Davies | 0 | son | — | D.C. |
| 31 | William E. Nelson | 54 | head | Treasurer | S. Dakota |
| 32 | Susie Nelson | 54 | wife | — | Iowa |
| 33 | Extra Line | None | — | — | — |
| 34 | Ralph Valusem | 46 | head | Dentist | Iowa |
| 35 | Geraldine Valusem | 41 | wife | — | Michigan |
| 36 | William Nuss | 46 | head | Clerk | Maryland |
| 37 | Lillian Nuss | 45 | wife | — | Maryland |
| 38 | Karl Knaus | 49 | head | Agriculturalist | Kansas |
| 39 | Inez A. Knaus | 53 | wife | — | Kansas |
| 40 | Harry Scaggs | 25 | head | Truck Driver | D.C. |
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)