2000
#131,366
National surname rank
Recorded bearers 119
First available Census row
Per 100,000 0.04
Very Rare Last name
Casterton
An English habitational surname deriving from places called "Casterton" in Cumbria, Yorkshire, or Derbyshire.
According to the 2020 US Census Bureau surname tables, roughly 125 Americans carry the last name Casterton. That puts it at #150,205 in the national surname ranking, appearing at a frequency of 0.04 per 100,000 people (about 1 in 2,742,035 residents).
This page is the full Name Census profile for the Casterton surname. You will find the Census Bureau frequency data, a multi-census history view, an ancestry and ethnicity breakdown based on self-reported demographics, the name's meaning and origin where available, and answers to the most common questions people ask about this surname.
For British records, Name Census UK has a British surname profile for Casterton with 1881 census detail, origin facts and modern UK distribution where available.
Bearers in the US
125
1 in 2,742,035
Census rank
#150,205
2020 decennial data
Per 100,000
0.0
Frequency rate
Recorded bearers
109
very rare in the US
Popularity narrative
The Census Bureau recorded 109 bearers of the surname Casterton in its 2020 decennial surname file. At a rate of 0.04 per 100,000 residents, it holds the 150205th position in the national surname ranking.
Among Census respondents with the surname Casterton, the largest self-reported group is White at 96.3%. The next largest groups are Two or More Races (3.7%).
Origin
Meaning and origin of Casterton
The surname Casterton has its origins in England, tracing back to the medieval period. It is derived from the place name "Casterton," which refers to several locations in the country, including villages in Cumbria, Derbyshire, and Westmorland. The name is believed to come from the Old English words "cæster" meaning "Roman town or camp" and "tun" meaning "farm or settlement."
One of the earliest recorded mentions of the surname can be found in the Domesday Book of 1086, where it appears as "Castretone." This reference suggests that the name was already established in certain regions of England by the time of the Norman Conquest.
In the 13th century, the surname appears in various forms such as "de Casterton" and "Castertun," indicating its use as a locational surname derived from the place names. During this time, the name was particularly prominent in the northern counties of England, where many of the Casterton villages were located.
Notable individuals with the surname Casterton include:
1. William de Casterton (c. 1260 - c. 1330), a 13th-century English clergyman who served as the Archdeacon of Carlisle.
2. John Casterton (c. 1390 - 1456), a 15th-century English theologian and philosopher who studied at the University of Oxford.
3. Thomas Casterton (c. 1520 - 1592), a 16th-century English landowner and politician who served as a Member of Parliament for Westmorland in 1559.
4. Elizabeth Casterton (c. 1610 - 1685), an English writer and poet known for her religious works and devotional poetry.
5. Sir Robert Casterton (1675 - 1741), a prominent English military officer who served in the War of the Spanish Succession and later became the Governor of Gibraltar.
Over time, as people migrated from their ancestral homes, the surname Casterton spread to other parts of England and beyond. It is now found in various spellings, including Casterton, Casterton, and Casterton, reflecting regional variations and adaptations.
Demographics
Ancestry and ethnicity for Casterton
Among Census respondents with the surname Casterton, the largest self-reported group is White at 96.3%. The next largest groups are Two or More Races (3.7%).
The bar chart below shows how Casterton bearers described their own race and ethnicity on the 2020 Census form. The Census Bureau groups responses into six broad categories: White, Black or African American, Hispanic or Latino, Asian and Pacific Islander, American Indian and Alaska Native, and Two or More Races. When a category has too few respondents for a given surname, the Bureau suppresses the figure to protect individual privacy, which is why some names show fewer than six slices.
Percentages are shown for every Census year so the breakdown stays comparable over time. When the source file also includes raw headcounts, Name Census shows those alongside the percentages in the legend.
Keep in mind that these are self-reported numbers. A person's surname does not determine their race or ethnicity, and the distribution you see here reflects the specific population who happened to carry the Casterton surname at the time of the 2020 Census, not any inherent property of the name itself.
- White96.3% · 105
- Two or more races3.7% · 4
Timeline
Historical Census data for Casterton
Casterton appears in 3 published Census surname files: 2000, 2010, 2020. The cards below show how the name's rank and bearer count changed across each release.
2010
#140,157
National surname rank
Recorded bearers 119
+0 bearers (+0.0%)
Per 100,000 0.04
Rank movement Down 8,791 places
2020
#150,205
National surname rank
Recorded bearers 109
-10 bearers (-8.4%)
Per 100,000 0.04
Rank movement Down 10,048 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2000 | #131,366 | 119 | 0.04 | First available Census row | First available Census row |
| 2010 | #140,157 | 119 | 0.04 | +0 bearers (+0.0%) | Down 8,791 places |
| 2020 | #150,205 | 109 | 0.04 | -10 bearers (-8.4%) | Down 10,048 places |
For 2020, the Census Bureau published race and Hispanic-origin columns as counts rather than percentages. Name Census converts those counts back into shares so the ancestry section stays comparable with the older surname files.
Year on year
2010 vs 2020 Census
How has the Casterton surname changed between Census years? The chart shows bearer count side by side, and the table compares rank, count, and frequency.
Census year comparison
20102020
| Metric | 2010 | 2020 | Change |
|---|---|---|---|
| Rank | #140,157 | #150,205 | -7.2% |
| Count | 119 | 109 | -8.4% |
| Per 100K | 0.04 | 0.04 | -8.8% |
Between the 2010 and 2020 Census, the number of Casterton bearers went from 119 to 109 (-8.4% change). The surname moved down 10,048 positions in the national ranking, going from #140,157 to #150,205.
FAQ
Casterton surname: questions and answers
How many people in the U.S. have the surname Casterton?
Name Census estimates that about 125 living Americans carry the surname Casterton. Using the current population baseline, that works out to roughly 1 in 2,742,035 residents.
How common is Casterton?
Casterton ranks #150,205 in the 2020 Census surname tables and is classified on this site as "Very Rare." The Census recorded the name at a frequency of 0.04 per 100,000 residents, which is about 0 people out of every 100,000.
How many people with this surname were counted in the Census?
The raw 2020 Census file counted 109 people with the surname Casterton. That is different from the site's living-bearer estimate (125), which projects the surname's present-day count by applying the Census frequency rate to the current U.S. population.
What does 0.04 per 100,000 actually mean?
It is the Census Bureau's normalized frequency measure. A rate of 0.04 per 100,000 means that if you picked a random group of 100,000 U.S. residents, you would expect about 0 of them to have the surname Casterton.
Has Casterton become more or less common over time?
Between 2010 and 2020, the surname Casterton went from 119 recorded bearers to 109. That is a decrease of 10 (-8.4%). In the national ranking it fell from #140,157 to #150,205.
What does the Census say about the background of Casterton?
Among Census respondents with the surname Casterton, the largest self-reported group is White at 96.3%. The next largest groups are Two or More Races (3.7%). These figures come from the 2020 Census Bureau surname tables, based on how respondents described their own race and ethnicity.
Which group reports this surname most often?
White is the largest self-reported group for the surname Casterton in the 2020 Census, accounting for 96.3% (105 people in the source table).
What is the full ancestry breakdown?
Casterton appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are White (96.3%), Two or More Races (3.7%). For 2020, the source file also published raw headcounts for each group, which is why this page can show both percentages and counts in the ancestry section.
Is this page using the latest Census data?
Yes. This page is using the latest surname file currently loaded on Name Census, which is 2020. The historical section above also keeps any older Census surname entries we have for Casterton (2000, 2010, 2020).
Does the Census include every surname?
No. The Census Bureau only publishes surnames that appeared at least 100 times in a given decennial Census. That means very rare surnames are excluded entirely, and a surname can appear in one Census release but disappear from a later one if it falls below the reporting threshold.
Why don't the ancestry percentages always add up to exactly 100%?
There are two main reasons: rounding and suppression. The Census Bureau rounds published values, and it may suppress very small cells to protect privacy. For 2020, the Bureau also published raw group counts rather than direct percentages, so Name Census converts those counts back into shares for comparability across census years.
What does Casterton mean?
An English habitational surname deriving from places called "Casterton" in Cumbria, Yorkshire, or Derbyshire. The fuller origin note on this page goes into more detail.
Where does the surname data come from?
All surname statistics on Name Census are drawn from the US Census Bureau's decennial surname frequency tables. These files list every surname that appeared 100 or more times in the 2020 Census, along with a count, a per-100,000 rate, and a self-reported demographic breakdown. You can read the full explanation on our methodology page.
How does Name Census estimate living bearers?
For surnames, Name Census does not age cohorts the way it does for first names. Instead, it takes the Census Bureau's published frequency for Casterton (0.04 per 100,000) and applies that rate to the current U.S. resident population to estimate how many living Americans have the surname today.
How common is the surname Casterton?
Find out how many people have the last name Casterton on our sister site HowManyOfMe.org — a quick modern estimate with the living-bearer count front and centre.