MC
Mary Costello — 1920 US Census Record
Model Tree available1920 United States Federal Census · Denver, Colorado
Our Model Tree links this Mary Costello across the 1900, 1910 and 1920 US Censuses in Denver, Colorado (XGBoost, ~Confirmed), with identified parents Katherine & Kate — first a daughter (b.~1892), then head of a 2-person household.
Age 28
b. ~1892
Female
Daughter
Born: Colorado
Single
1920 Census Record Details
| Census Year | 1920 |
| Location | Denver, Colorado |
| Surname | Costello |
| Given Name | Mary E |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 28 |
| Marital Status | Single |
| Birthplace | Colorado |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Additional Details | |
| Occupation | Stenographer |
| Industry | Oil Producers Office |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
| Occupation | Stenographer |
| Township / Ward | Denver City |
| Est. Birth Year | ~1892 |
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.
2 people recorded at the same address in the 1920 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Costello | Daughter | — | 28 | ~1892 |
| Katherine Costello | Head | — | 61 | ~1859 |
Census Appearances
1900
Arapahoe, Colorado
Daughter, age 9
Arapahoe, Colorado · implied b. ~1891 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Costello |
| Given Name | Mary J |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 9 |
| Marital Status | Single |
| Birthplace | Colorado |
| Birth Month | April |
| Birth Year | 1891 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | At school |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
1910
Denver, Colorado
Daughter, age 18
Denver, Colorado · implied b. ~1892 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Costello |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Colorado |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
1920
Denver, Colorado
Daughter, age 28
Denver, Colorado · implied b. ~1892 — 2 household members
| Surname | Costello |
| Given Name | Mary E |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 28 |
| Marital Status | Single |
| Birthplace | Colorado |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Stenographer |
| Industry | Oil Producers Office |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
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 Mary Costello across 3 US Census years (1900, 1910 and 1920) in 2 locations, using XGBoost record linkage. Identified parents: mother Katherine Costello (~0.92 confidence) and mother Kate Costello (~0.92 confidence) and mother Catherine Costello (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Katherine Costello
b. ~1859
Source mother
● Household
· direct · ~0.92
Mother
Kate Costello
b. ~1863
Source mother
● Household
· direct · ~0.92
Mother
Catherine Costello
b. ~1867
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Costello
Daughter · 1920 · age 28 · b. ~1892 · Colorado
★ You are viewing this record
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1920 US Federal Census — Denver, Colorado
Open full size
1920 US Federal Census — Denver, Colorado
Page Contents
50 people indexed on this census page (ia:1920:14thcensusofpopu161unit:0390)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | Andrew F Wennersten | 37 | Head | Checker | Sweden |
| 52 | Annie O Wennersten | 31 | Wife | — | Sweden |
| 53 | Earl R Wennersten | 10 | Son | — | Colorado |
| 54 | Ruth K Wennersten | 6 | Daughter | — | Colorado |
| 55 | Walter Sullivan | 32 | Head | Laborer | Wyoming |
| 56 | Lillian B Sullivan | 28 | Wife | — | Colorado |
| 57 | Isabella S Donaldson | 62 | Head | — | Scotland |
| 58 | Annie O Donaldson | 36 | Daughter | Saleslady | New Mexico |
| 59 | Edith S Donaldson | 34 | Daughter | Bookkeeper | Colorado |
| 60 | Jessie D Johnson | 31 | Daughter | Bundler | Colorado |
| 61 | Gertie E Johnson | 12 | Daughter | — | Colorado |
| 62 | Robert W Johnson | 10 | Son | — | Colorado |
| 63 | Donald Johnson | 8 | Son | — | Colorado |
| 64 | David Ericson | 58 | Head | Carpenter | Sweden |
| 65 | Josephine M Ericson | 54 | Wife | — | Sweden |
| 66 | Naomi J Ericson | 18 | Daughter | Teacher | Colorado |
| 67 | Katherine A Costello | 61 | Head | — | Ireland |
| 68 | Mary E Costello THIS PERSON | 28 | Daughter | Stenographer | Colorado |
| 69 | William D Merrell | 62 | Head | Laborer | Pennsylvania |
| 70 | Mary E Merrell | 62 | Wife | — | New York |
| 71 | Mary E Merrell | 28 | Daughter | — | Nebraska |
| 72 | Grace E Merrell | 25 | Daughter | — | Nebraska |
| 73 | Ernest A Lund | 44 | Head | Salesman | Colorado |
| 74 | Betty S Lund | 40 | Wife | — | Sweden |
| 75 | Doris E Lund | 2 | Daughter | — | Colorado |
| 76 | Anna Lund | 46 | Head | — | Sweden |
| 77 | Carl S Lund | 20 | Son | Lineman | Colorado |
| 78 | Oscar A Lund | 19 | Son | Driver | Colorado |
| 79 | Albert E Lund | 16 | Son | Salesman | Colorado |
| 80 | Louis P Browning | 43 | Head | Salesman | Connecticut |
| 81 | Minnie H Browning | 37 | Wife | — | Colorado |
| 82 | Earl L Browning | 9 | Son | — | Colorado |
| 83 | Edward L Stewart | 29 | Head | Driver | Missouri |
| 84 | Marie L Stewart | 26 | Wife | — | Illinois |
| 85 | Eugene P Stewart | 7 | Son | — | Colorado |
| 86 | Audrie E Stewart | 5 | Daughter | — | Colorado |
| 87 | Lawrence J Story | 30 | Head | Machinist | Iowa |
| 88 | Rose L Story | 27 | Wife | — | Iowa |
| 89 | Ferdinand Watts | 63 | Head | Cabinet Maker | Sweden |
| 90 | Anna M Watts | 55 | Wife | — | Sweden |
| 91 | Elsa B Watts | 12 | Daughter | — | Colorado |
| 92 | Charles E Butler | 46 | Head | Machinist | Missouri |
| 93 | Anna M Butler | 47 | Wife | — | Wyoming |
| 94 | Frederick Pauley | 67 | Head | Millwright | Switzerland |
| 95 | Della E Pauley | 31 | Daughter | — | Colorado |
| 96 | Maude Pauley | 37 | Daughter-in-law | Executive | Kansas |
| 97 | George W Forster | 37 | Son | Machinist | New York |
| 98 | Belotti Forster | 27 | Wife | — | New York |
| 99 | Howard W Howard | 44 | Head | Expressman | Indiana |
| 100 | Nancy E Howard | 41 | Wife | — | Indiana |
Pedigree Summary
Mary
Gen 1 · 3 parents
~0.92
Max depth 4 (1900–1950 window)
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1920 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)