ImmigrationDBVerified immigration data

Thorold

Thorold had 23,716 residents in 2021 and is a city in Canada. In May 2021, the foreign population was 1,700.

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Higher unemployment than 97% of Canadian cities that publish it and cleaner air than 74% of Canadian cities that publish it.

Foreign residents1,700 peoplecity · Verified 2026-07-15Official source · Statistics Canada Census Profile 2021 characteristic 1512: not Canadian citizens, population in private households, 25% sample data, at CSD grain. This is the exact foreign-citizenship interpretation used for foreign_population_total; it is not immigrant status.
Population23,716 peoplecity · Verified 2026-06-12Official source · Statistics Canada — Census Profile 2021 (Thorold, CSD 3526010)
Unemployment rate15.3 %city · Verified 2026-07-26Official source · Statistics Canada — 2021 Census Profile, unemployment rate at CSD grain
NO₂ — annual mean5.8858 µg/m³city · Verified 2026-07-15Official source · Official ECCC/NAPS 2024 station DMean observation retained at source grain; no place value is asserted because the approved 25 km observation condition is not met.
PM10 — annual mean12 µg/m³city · Verified 2026-07-15Official source · Official ECCC/NAPS 2024 annual daily-mean station observations, reproducibly aggregated as an arithmetic mean for eligible stations within 25 km of the target city coordinate. This is a derived place observation, not an asserted municipal monitor aggregate.
PM2.5 — annual mean3.03 µg/m³city · Verified 2026-07-15Official source · Official ECCC/NAPS 2024 annual daily-mean station observations, reproducibly aggregated as an arithmetic mean for eligible stations within 25 km of the target city coordinate. This is a derived place observation, not an asserted municipal monitor aggregate.
Every value keeps its source, geographic scope and verification date · Last checked 2026-07-26

Who Thorold may suit

Relative profile scores use comparable published values. They are a decision aid, not a personal recommendation.

Try your profile
Remote worker61%strong on work, weak on safety · range 47–75% from published values
Skilled employee52%strong on work, weak on safety · range 38–66% from published values
Student57%strong on cost, weak on healthcare · range 43–71% from published values
Family46%strong on safety, weak on legal route · range 32–60% from published values
Retirement64%strong on air quality, weak on admin · range 50–78% from published values

Population and city profile

The city covered 83 km² in 2021. Population density was 285.9 people per km² in 2021.

Who lives hereResidents by nationality, % of population
Thorold residents by nationalityBy nationalityNational passport92.8%Foreign residents 7.2%

Derived from the published population and foreign-resident counts.

MetricValueVerifiedSource
City area83 km22026-06-122021Official sourceStatistics Canada — Census Profile 2021 (Thorold, CSD 3526010) Source-backed value
Foreign residents1,700 people2026-07-152021Official sourceStatistics Canada Census Profile 2021 characteristic 1512: not Canadian citizens, population in private households, 25% sample data, at CSD grain. This is the exact foreign-citizenship interpretation used for foreign_population_total; it is not immigrant status. Source-backed value
Population density285.9 people/km²2026-07-152021Official sourceStatistics Canada Census Profile 2021 characteristic 6: population density per square kilometre at CSD grain. This is the exact CSD value; it is not a CMA or province observation. Source-backed value
Population23,716 people2026-06-122021Official sourceStatistics Canada — Census Profile 2021 (Thorold, CSD 3526010) Source-backed value
Population over time22 published observations, 2001–2022
Population in Thorold by year, residents17,62420,19822,77325,34720012003200520072009201120132015201720192021202224,814residents

Population rose 32.1% between 2001 and 2022, from 18,783 to 24,814.

Each point keeps the source and period it was published with.

Work and income

The unemployment rate was 15.3% in May 2021.

Unemployment across cities in CanadaWhere Thorold lands among 166 measured cities
unemployment rate, % · measured cities in Canada per band224–6336–8358–103810–122912–14614–16Thorold 15.3%218–20122–24unemployment rate, % · measured cities in Canada per band

Published unemployment rates for cities in the same country.

MetricValueVerifiedSource
Unemployment rate15.3 %country median 9.4% — 62% above2026-07-262021Official sourceStatistics Canada — 2021 Census Profile, unemployment rate at CSD grain Source-backed value

Climate and air quality

Annual PM2.5 was 3.03 µg/m³ in 2024. Annual NO₂ was 5.89 µg/m³ in 2024. Annual PM10 was 12 µg/m³ in 2024.

Air quality vs health guidelinesAnnual means against WHO 2021 guidelines and EU legal limits
Thorold annual air pollutant levels against WHO 2021 guidelines and EU legal limitsCity valueWHO guidelineEU limit5253.0PM2.5154012.0PM1010405.9NO₂µg/m³

City values from the published air-quality observations. WHO 2021 guidelines and EU limit values are published constants.

PM2.5 across cities in CanadaWhere Thorold lands among 137 measured cities
annual PM2.5, µg/m³ · measured cities in Canada per band31–2312–3533–4Thorold 3.0164–5185–617–818–929–10310–11113–14215–16316–17117–18120–21140–41annual PM2.5, µg/m³ · measured cities in Canada per band

Published annual means from the same national measurement network.

MetricValueVerifiedSource
NO₂ — annual mean5.8858 µg/m³country median 6.6 — 11% below2026-07-152024Official sourceOfficial ECCC/NAPS 2024 station DMean observation retained at source grain; no place value is asserted because the approved 25 km observation condition is not met. Source-backed value
PM10 — annual mean12 µg/m³country median 10.5 — 14% above2026-07-152024Official sourceOfficial ECCC/NAPS 2024 annual daily-mean station observations, reproducibly aggregated as an arithmetic mean for eligible stations within 25 km of the target city coordinate. This is a derived place observation, not an asserted municipal monitor aggregate. Source-backed value
PM2.5 — annual mean3.03 µg/m³country median 3.6 — 15% below2026-07-152024Official sourceOfficial ECCC/NAPS 2024 annual daily-mean station observations, reproducibly aggregated as an arithmetic mean for eligible stations within 25 km of the target city coordinate. This is a derived place observation, not an asserted municipal monitor aggregate. Source-backed value

Mobility and administration

MetricValueVerifiedSource
Nearest airportYCM code2026-06-13FreshOfficial sourceOurAirports — airports.csv Source-backed value
Distance to nearest airport8.6 km2026-06-13FreshOfficial sourceOurAirports — airports.csv Source-backed value

Worked out from these numbers

Arithmetic on the published values above. Each one names what it assumed.

How international is the population?

7.2% of residents hold a foreign nationality — 1,700 people of 23,716 people. This counts nationality, not place of birth, so long-settled residents who naturalised are not in it.

Common questions

Answered from the published values on this page, each with its source and date.

What is the unemployment rate in Thorold?

The unemployment rate is 15.3 %. Source: Statistics Canada — 2021 Census Profile, unemployment rate at CSD grain, checked 2026-07-26.

Is the air quality good in Thorold?

The annual PM2.5 mean is 3.03 µg/m³. The WHO 2021 guideline is 5 µg/m³ and the EU limit value is 25 µg/m³, so this reading is within the WHO guideline. Source: Official ECCC/NAPS 2024 annual daily-mean station observations, reproducibly aggregated as an arithmetic mean for eligible stations within 25 km of the target city coordinate. This is a derived place observation, not an asserted municipal monitor aggregate., checked 2026-07-15.

How many people live in Thorold?

The published population is 23,716 people. Source: Statistics Canada — Census Profile 2021 (Thorold, CSD 3526010), checked 2026-06-12.

How many foreign residents live in Thorold?

1,700 people residents hold a foreign nationality. Source: Statistics Canada Census Profile 2021 characteristic 1512: not Canadian citizens, population in private households, 25% sample data, at CSD grain. This is the exact foreign-citizenship interpretation used for foreign_population_total; it is not immigrant status., checked 2026-07-15.

Cities of a similar size in Canada

Closest published populations, for a like-for-like comparison.

All Canada cities
L'Assomption23,826 residentsTecumseh23,605 residentsSaint-Lin-Laurentides24,340 residentsParadise22,957 residentsCollingwood24,511 residentsBeloeil24,610 residents

Sources

Statistics Canada Census Profile 2021 characteristic 1512: not Canadian citizens, population in private households, 25% sample data, at CSD grain. This is the exact foreign-citizenship interpretation used for foreign_population_total; it is not immigrant status.Official source · Checked 2021-05-11Statistics Canada — Census Profile 2021 (Thorold, CSD 3526010)Official source · Checked 2026-07-14Statistics Canada — 2021 Census Profile, unemployment rate at CSD grainOfficial source · Checked 2026-07-26Official ECCC/NAPS 2024 station DMean observation retained at source grain; no place value is asserted because the approved 25 km observation condition is not met.Official source · Checked 2026-07-15Official ECCC/NAPS 2024 annual daily-mean station observations, reproducibly aggregated as an arithmetic mean for eligible stations within 25 km of the target city coordinate. This is a derived place observation, not an asserted municipal monitor aggregate.Official source · Checked 2026-07-15Official ECCC/NAPS 2024 annual daily-mean station observations, reproducibly aggregated as an arithmetic mean for eligible stations within 25 km of the target city coordinate. This is a derived place observation, not an asserted municipal monitor aggregate.Official source · Checked 2026-07-15

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