HC
Helen Cooper — 1940 US Census Record
Model Tree available1940 United States Federal Census · Frederick-County, Maryland
Our Model Tree links this Helen Cooper across the 1920, 1930 and 1940 US Censuses in Frederick-County, Maryland (XGBoost, ~Confirmed), with identified parents Alton & Herbert — first a daughter (b.~1909), then head of a 6-person household.
Age 31
b. ~1909
Female
Daughter
Born: Maryland
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Frederick-County, Maryland |
| Surname | Cooper |
| Given Name | Helen |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 31 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | Election District 25 |
| 1935 Residence (County) | Frederick |
| Additional Details | |
| Occupation | Clerk |
| Industry | Retail Store |
| Class of Worker | PW |
| Hours Worked | 50 |
| Income (1939) | 220 |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Occupation | Clerk |
| Township / Ward | Election District 25 |
| Est. Birth Year | ~1909 |
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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Helen | Age | Birth yr |
|---|---|---|---|---|
| Mary Cooper | Daughter | — | 22 | ~1918 |
| Elsie Cooper | Daughter | — | 30 | ~1910 |
| Herbert Cooper | Head | — | 69 | ~1871 |
| Newton Cooper | Son | — | 25 | ~1915 |
| Helen Cooper | Daughter | — | 31 | ~1909 |
| Edith Cooper | Daughter | — | 13 | ~1927 |
Census Appearances
1920
Frederick, Maryland
Daughter, age 10
Frederick, Maryland · implied b. ~1910 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cooper |
| Given Name | Hazel |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Virginia |
| Mother's Birthplace | Virginia |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1930
Frederick, Maryland
Daughter, age 21
Frederick, Maryland · implied b. ~1909 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cooper |
| Given Name | Helen |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Virginia |
| Mother's Birthplace | Virginia |
| Occupation | Clerk |
| Industry | Department Store |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1940
Frederick-County, Maryland
Daughter, age 31
Frederick-County, Maryland · implied b. ~1909 — 6 household members
| Surname | Cooper |
| Given Name | Helen |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 31 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | Election District 25 |
| 1935 Residence (County) | Frederick |
| Occupation | Clerk |
| Industry | Retail Store |
| Class of Worker | PW |
| Hours Worked | 50 |
| Income (1939) | 220 |
| Highest Grade | H-4 |
| 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 Helen Cooper across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Alton Cooper (~0.92 confidence) and father Herbert Cooper (~0.92 confidence) and father N Cooper (~0.92 confidence) and mother Alice Cooper (~0.92 confidence) and mother Lily Cooper (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Alton Cooper
b. ~1884
Source father
● Household
· direct · ~0.92
Father
Herbert Cooper
b. ~1871
Source father
● Household
· direct · ~0.92
Father
N Cooper
b. ~1871
Source father
● Household
· direct · ~0.92
Mother
Alice Cooper
b. ~1890
Source mother
● Household
· direct · ~0.92
Mother
Lily Cooper
b. ~1877
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Helen Cooper
Daughter · 1940 · age 31 · b. ~1909 · Maryland
★ You are viewing this record
Sibling
Elsie Cooper
Sibling · 1940 · age 30
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Cooper
Sibling · 1940 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Newton Cooper
Sibling · 1940 · age 25
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edith Cooper
Sibling · 1940 · age 13
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 — Frederick-County, Maryland
Open full size
1940 US Federal Census — Frederick-County, Maryland
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01549-00670)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Son Homer | None | M | — | — |
| 42 | William Everhart | 67 | Head | — | Maryland |
| 43 | Lizzie Everhart | 66 | Wife | — | West Virginia |
| 44 | Bessie Everhart | 22 | Daughter | Clerk | Maryland |
| 45 | Orenzo Interviler | 39 | Head | — | Virginia |
| 46 | Harvey Anderson | 35 | Head | Clerk | Maryland |
| 47 | Lucille Anderson | 33 | Wife | — | Maryland |
| 48 | William Anderson | 12 | Son | — | Maryland |
| 49 | Herbert Cooper | 69 | Head | — | Virginia |
| 50 | Helen Cooper THIS PERSON | 31 | Daughter | Clerk | Maryland |
| 51 | Elsie Cooper | 30 | Daughter | Clerk | Maryland |
| 52 | Newton Cooper | 25 | Son | Mechanic | Maryland |
| 53 | Mary Cooper | 22 | Daughter | — | Maryland |
| 54 | Edith Cooper | 13 | Daughter | — | Maryland |
| 55 | Leroy Stewart | 49 | Head | Labourer | West Virginia |
| 56 | Ada Stewart | 44 | Wife | — | Virginia |
| 57 | Russell Stewart | 18 | Son | — | Maryland |
| 58 | Doris Stewart | 17 | Daughter | — | Maryland |
| 59 | La Verne Stewart | 15 | Daughter | — | Maryland |
| 60 | Gerald Stewart | 13 | Son | — | Maryland |
| 61 | Dale Stewart | 9 | Son | — | Maryland |
| 62 | George Hansen | 61 | Head | Engineer | West Virginia |
| 63 | Nora Hansen | 56 | Wife | — | Maryland |
| 64 | William Barton | 58 | Head | Brakeman | Maryland |
| 65 | Rose Barton | 42 | Wife | — | Maryland |
| 66 | Emma Copeland | 85 | Mother-in-law | — | Maryland |
| 67 | Earl Roberts | 27 | Head | Labourer | Maryland |
| 68 | Eva Roberts | 26 | Wife | — | Maryland |
| 69 | James Roberts | 7 | Son | — | Maryland |
| 70 | Dorothy Roberts | 3 | Daughter | — | Maryland |
| 71 | Earl Roberts | 2 | Son | — | Maryland |
| 72 | Frank Mccover | 49 | Head | Barber | Maryland |
| 73 | Irene Mccover | 46 | Wife | — | Maryland |
| 74 | Frank Jr. Mccover | 20 | Son | Desk Clerk | Maryland |
| 75 | Guy Mcdonald | 74 | Head | — | Maryland |
| 76 | Mary Barnhart | 45 | Daughter | — | Maryland |
| 77 | Ottie Miller | 43 | Daughter | Elementary Teacher | Maryland |
| 78 | Charles Barnhart | 52 | Son-in-law | Brakeman | Maryland |
| 79 | Clarence Miller | 43 | Son-in-law | Brakeman | Virginia |
| 80 | Grover Stewart | 57 | Head | Brakeman | West Virginia |
Pedigree Summary
Helen + 4 siblings
Gen 1 · 5 parents
~0.92
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)