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William Harmon — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Baltimore-County, Maryland
Our Model Tree links this William Harmon across the 1930 and 1940 US Censuses in Baltimore-County, Maryland (XGBoost, ~Confirmed) — first a son (b.~1921), then head of a 7-person household.
Age 19
b. ~1921
Male
Son
Born: Maryland
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Baltimore-County, Maryland |
| Surname | Harmon |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | Catonsville (pt) |
| 1935 Residence (County) | Baltimore |
| Additional Details | |
| Occupation | Coil winder |
| Industry | electric company |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 496 |
| Highest Grade | H-4 |
| 1935 Residence | Same house |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Occupation | Coil Winder |
| Township / Ward | Catonsville Pt |
| Est. Birth Year | ~1921 |
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.
7 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| Elizabeth Harmon | Daughter | — | 4 | ~1936 |
| Robert Harmon | Son | — | 17 | ~1923 |
| Hazel Harmon | Spouse | — | 44 | ~1896 |
| Mary Harmon | Daughter | — | 9 | ~1931 |
| Anthony Harmon | Head | — | 43 | ~1897 |
| William Harmon | Son | — | 19 | ~1921 |
| James Harmon | Son | — | 15 | ~1925 |
Census Appearances
1930
Baltimore, Maryland
Son, age 7
Baltimore, Maryland · implied b. ~1923 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Harmon |
| Given Name | William D |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | Black |
| Age | 7 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Virginia |
| Mother's Birthplace | Virginia |
| Can Read/Write | Yes |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1940
Baltimore-County, Maryland
Son, age 19
Baltimore-County, Maryland · implied b. ~1921 — 7 household members
| Surname | Harmon |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | Catonsville (pt) |
| 1935 Residence (County) | Baltimore |
| Occupation | Coil winder |
| Industry | electric company |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 496 |
| Highest Grade | H-4 |
| 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 William Harmon across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
William Harmon
Son · 1940 · age 19 · b. ~1921 · Maryland
★ You are viewing this record
Sibling
Elizabeth Harmon
Sibling · 1940 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Harmon
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Harmon
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Harmon
Sibling · 1940 · age 9
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 — Baltimore-County, Maryland
Open full size
1940 US Federal Census — Baltimore-County, Maryland
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01503-00262)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Amelia O. Reinach | 51 | Head | Restaurant Owner | Maryland |
| 2 | Walter J. Reinach | 28 | Son | Attendant | Maryland |
| 3 | Audrey Reinach | 28 | Daughter-in-law | — | Maryland |
| 4 | James W. Stoddard | 73 | Head | Dining Room Attendant | Maryland |
| 5 | Ida E. Stoddard | 68 | Wife | — | Maryland |
| 6 | John M. Hurd | 32 | Head | Veterinary Doctor | Nebraska |
| 7 | Grace B. Hurd | 26 | Wife | — | Oklahoma |
| 8 | William P. Heim | 70 | Head | — | Maryland |
| 9 | Magdalena Heim | 57 | Wife | — | Maryland |
| 10 | Edward J. Brenchmann | 31 | Head | Electrical Contractor | Maryland |
| 11 | Frances T. Brenchmann | 29 | Wife | — | New York |
| 12 | Edgar D. Freeland | 68 | Head | Operator | Maryland |
| 13 | Maude S. Freeland | 58 | Wife | — | Maryland |
| 14 | Edgar D. Jr. Freeland | 35 | Son | Traveling Salesman | Maryland |
| 15 | Conrad J. Mckenzie | 46 | Head | — | Maryland |
| 16 | Eleanor L. Mckenzie | 47 | Wife | Private Secretary | Maryland |
| 17 | Edmund H. Mckenzie | 21 | Son | Mechanic | Maryland |
| 18 | Edith R. Mckenzie | 18 | Daughter | Private Secretary | Maryland |
| 19 | Catherine V. Mckenzie | 15 | Daughter | — | Maryland |
| 20 | Dwight P. Cary | 75 | Head | — | Illinois |
| 21 | Jane G. Cary | 55 | Wife | — | Ohio |
| 22 | Cary M. Hanlon | 70 | Lodger | Pastry Cook | New York |
| 23 | Harry L. Miller | 56 | Head | Chief Clerk | Maryland |
| 24 | Mary L. Miller | 55 | Wife | — | Virginia |
| 25 | Harry L. Jr. Miller | 31 | Son | Operator | Virginia |
| 26 | Frank L. Miller | 28 | Son | Traveling Salesman | Maryland |
| 27 | Paul M. Miller | 25 | Son | Traffic Department | Maryland |
| 28 | Mary L. Miller | 15 | Daughter | — | Maryland |
| 29 | Arthur R. Wood | 58 | Head | Plumber And Heater | Maryland |
| 30 | Elsie A. Wood | 57 | Wife | — | Maryland |
| 31 | Jane A. Wood | 23 | Daughter | Social Worker | Maryland |
| 32 | Robert E. Wood | 20 | Son | General Assistant | Maryland |
| 33 | Eileen Sharp | 17 | Lodger | New Worker | West Indies |
| 34 | Anthony W. Harmon | 43 | Head | Salesman | Maryland |
| 35 | Hazel B. Harmon | 44 | Wife | — | Maryland |
| 36 | William Harmon THIS PERSON | 19 | Son | Coil Winder | Maryland |
| 37 | Robert Harmon | 17 | Son | — | Maryland |
| 38 | James Harmon | 15 | Son | — | Maryland |
| 39 | Mary F. Harmon | 9 | Daughter | — | Maryland |
| 40 | Elizabeth Harmon | 4 | Daughter | — | Maryland |
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)