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John Boyd — 1940 US Census Record
Model Tree available1940 United States Federal Census · Harford-County, Maryland
Our Model Tree links this John Boyd across the 1920, 1930 and 1940 US Censuses in Harford-County, Maryland (XGBoost, ~Confirmed), with identified parents Michael & Samuel — first a son (b.~1899), then head of a 7-person household.
Age 41
b. ~1899
Male
Son
Born: Maryland
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Harford-County, Maryland |
| Surname | Boyd |
| Given Name | John P. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 41 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | Havre de Grace |
| 1935 Residence (County) | Harford |
| Additional Details | |
| Occupation | Welder |
| Industry | Edgewood Arsenal |
| Class of Worker | GW |
| Hours Worked | 40 |
| Income (1939) | 464 |
| Highest Grade | No 6 |
| 1935 Residence | Same place |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Occupation | Welder |
| Township / Ward | Havre De Grace |
| Est. Birth Year | ~1899 |
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 John | Age | Birth yr |
|---|---|---|---|---|
| Edwin Davis | Head | — | 50 | ~1890 |
| May Boyd | Other | — | 32 | ~1908 |
| Michael Boyd | Other | — | 80 | ~1860 |
| Michael Boyd | Son | — | 43 | ~1897 |
| John Boyd | Son | — | 41 | ~1899 |
| Michael Davis | Son | — | 3 | ~1937 |
| Margaret Davis | Spouse | — | 39 | ~1901 |
Census Appearances
1920
None, Maryland
Son, age 20
None, Maryland · implied b. ~1900 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Boyd |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | Black |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Occupation | Laborer |
| Industry | General |
| Class of Worker | W |
| Can Read | No |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1930
Harford, Maryland
Son, age 31
Harford, Maryland · implied b. ~1899 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Boyd |
| Given Name | John R. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 31 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Occupation | Fisherman |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1940
Harford-County, Maryland
Son, age 41
Harford-County, Maryland · implied b. ~1899 — 7 household members
| Surname | Boyd |
| Given Name | John P. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 41 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | Havre de Grace |
| 1935 Residence (County) | Harford |
| Occupation | Welder |
| Industry | Edgewood Arsenal |
| Class of Worker | GW |
| Hours Worked | 40 |
| Income (1939) | 464 |
| Highest Grade | No 6 |
| 1935 Residence | Same place |
| 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 Boyd across 3 US Census years (1920, 1930 and 1940) in 3 locations, using XGBoost record linkage. Identified parents: father Michael Boyd (~0.92 confidence) and father Samuel Boyd (~0.92 confidence) and father Edwin Davis (~0.60 confidence) and mother Hester Boyd (~0.60 confidence) and mother Margaret Davis (~0.50 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.71
Father
Michael Boyd
b. ~1861
Source father
● Household
· direct · ~0.92
Father
Samuel Boyd
b. ~1868
Source father
● Household
· direct · ~0.92
Father
Edwin Davis
b. ~1890
Source father
● Household
· direct · ~0.6
Mother
Hester Boyd
b. ~1890
Source mother
● Household
· direct · ~0.6
Mother
Margaret Davis
b. ~1901
Source mother
● Household
· direct · ~0.5
This person
Anchor record
John Boyd
Son · 1940 · age 41 · b. ~1899 · Maryland
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Sibling
Michael Boyd
Sibling · 1940 · age 43
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Michael Davis
Sibling · 1940 · age 3
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 — Harford-County, Maryland
Open full size
1940 US Federal Census — Harford-County, Maryland
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01551-00841)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Annabelle Hamilton | 20 | Boarder | Marker | Maryland |
| 2 | William Hamilton | 28 | Boarder | Airplane Mechanic | Maryland |
| 3 | Robert Hamilton | 7 | Boarder | — | Maryland |
| 4 | Daisy Mccafrie | 33 | Boarder | Ironer | Virginia |
| 5 | Bettie Brown | 43 | Boarder | Waitress | Maryland |
| 6 | Fayettina | 38 | Head | Ironer | Virginia |
| 7 | Helen Fayettina | 10 | Daughter | — | Maryland |
| 8 | Henry H. Kiefule | 76 | Head | — | Maryland |
| 9 | Anna L. Kiefule | 56 | Wife | — | Maryland |
| 10 | Annie Marie Kiefule | 23 | Daughter | Clerk | Maryland |
| 11 | Frederick J. Kiefule | 30 | Son | Draftsman | Maryland |
| 12 | Edwin W. Davis | 50 | Head | Carpenter | Maryland |
| 13 | Margaret V. Davis | 39 | Wife | — | Maryland |
| 14 | Michael P. Boyd | 80 | Father | — | Maryland |
| 15 | Michael J. Boyd | 43 | Son | Fireman | Maryland |
| 16 | John P. Boyd THIS PERSON | 41 | Son | Welder | Maryland |
| 17 | May C. Boyd | 32 | Sister | — | Maryland |
| 18 | Michael Davis | 3 | Son | — | Maryland |
| 19 | Leo Cullum | 36 | Head | Laborer | Maryland |
| 20 | Edna Cullum | 30 | Wife | — | Maryland |
| 21 | George S. Barnman | 72 | Head | Locksmith | Maryland |
| 22 | Elizabeth B. Currier | 72 | Head | — | Pennsylvania |
| 23 | James O'Donnell | 33 | Boarder | Bridgeman | Pennsylvania |
| 24 | Elmer Artap | 42 | Boarder | Bridgeman | New Jersey |
| 25 | Michael Tomaski | 45 | Boarder | Bridgeman | New Jersey |
| 26 | Garfield Towney | 58 | Head | Machinist | Maryland |
| 27 | Lula Towney | 53 | Wife | — | Maryland |
| 28 | Percy Davis | 44 | Head | Cupola Fireman | Maryland |
| 29 | Lillian Davis | 39 | Wife | — | Maryland |
| 30 | Alonzo Davis | 19 | Son | — | Maryland |
| 31 | Richard D. Sheridan | 49 | Head | Gun Assembler | Maryland |
| 32 | Lillian D. Sheridan | 49 | Wife | — | Maryland |
| 33 | Sara D. Sheridan | 25 | Daughter | Teacher | Maryland |
| 34 | Lester R. Lindsay | 47 | Head | Police Inspector | Maryland |
| 35 | Pearl E. Lindsay | 47 | Wife | — | Maryland |
| 36 | Verna E. Lindsay | 22 | Daughter | Clerk | Maryland |
| 37 | Dorothy M. Lindsay | 15 | Daughter | — | Maryland |
| 38 | Edward Wertley | 69 | Head | Salesman | Pennsylvania |
| 39 | Mary E. Wertley | 62 | Wife | — | Pennsylvania |
| 40 | Top Tea Line Wertley | None | — | — | — |
Pedigree Summary
John + 2 siblings
Gen 1 · 5 parents
~0.71
Max depth 4 (1900–1950 window)
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)