--- entity_id: city:us:geonames:5336017 entity_type: city name: Charter Oak country_code: US country: United States slug: charter-oak canonical_url: https://immigrationdb.com/cities/us/charter-oak/ json_url: https://immigrationdb.com/data/cities/us/charter-oak.json markdown_url: https://immigrationdb.com/data/cities/us/charter-oak.md mcp_uri: immigrationdb://city/us/charter-oak snapshot_id: approved-static-8975a8c3d87026ab generated_at: 2026-09-14 last_verified: 2026-09-11 fact_count: 19 language_location_count: 0 employment_location_count: 0 city_intent_block_count: 0 usefulness_tier: useful indexable: true metric_dictionary_url: https://immigrationdb.com/data/metrics.json license_url: https://immigrationdb.com/about/copyright/ citation_schema: immigrationdb-citation-v1 citation_canonical_url: https://immigrationdb.com/cities/us/charter-oak/ citation_title: "Charter Oak, United States: rent, salary, jobs, air quality" citation_author: ImmigrationDB citation_publisher: ImmigrationDB citation_snapshot_id: approved-static-8975a8c3d87026ab citation_version: approved-static-8975a8c3d87026ab citation_retrieval_date: 2026-09-14 citation_build_date: 2026-09-14 citation_license_url: https://creativecommons.org/licenses/by/4.0/ --- # Charter Oak Charter Oak is a city in the United States, and the figures below are its published values. Charter Oak numbered 9,963 residents at the end of 2020. Charter Oak had an unemployment rate of 7.75% at the end of 2024. At the end of 2024, the foreign population in Charter Oak numbered 2,621. ## Answers Deterministic answers rendered from this page's published values. The JSON twin carries the machine-readable answer objects. ### How many people live in Charter Oak? The published population was 9,963 people in April 2020. - City-scope resident count. Density, foreign-resident counts and the country-wide figure are separate rows in the table below. - Value: 9,963 people · Period: April 2020 - Claims: claim-eb15e5b2206d ### Is the air quality good in Charter Oak? The annual PM2.5 mean is about 14.3 µg/m³ (2024) — above the WHO 2021 guideline of 5 µg/m³ but within the EU limit of 25 µg/m³. - Annual mean at the measuring site(s) serving the city; current-day readings differ. - Value: 14.3 µg/m³ · Period: 2024 - Claims: claim-8acbf77dffdf ### What is the typical salary in Charter Oak? The median gross salary is about 3,217 EUR/month (ACS 2020-2024 5-year). - City-scope median, gross, before tax and social contributions. - Value: 3,217 EUR/month · Period: ACS 2020-2024 5-year - Claims: claim-e2e03168f4d2 ### What is the unemployment rate in Charter Oak? The unemployment rate is about 7.8 % (2024). - Value: 7.8 % · Period: 2024 - Claims: claim-03456452898d ## Mobility Charter Oak's nearest airport was ONT, 23 km away and offered 14 direct destinations. ## Population Charter Oak covered an area of 2.4 km² at the end of 2025. Population density was 3,929.4 people per km² at the end of 2024. ## Climate Annual PM2.5 was 14.3 µg/m³ at the end of 2024. Monthly mean temperature moved from 13.1°C in January to 24.6°C in July. ## Facts | Metric | metric_id | Value | Scope | Observed | Verified | Freshness | Lane | Source | | --- | --- | --- | --- | --- | --- | --- | --- | --- | | Foreign residents | `foreign_population_total` | 2,621 people | city | 2024-12-31 | 2026-08-03 | stale | verified | [1] | | Population (built-up area) | `g01_population_total` | 9,442 people | city | 2020-12-31 | 2026-08-07 | stale | verified | [2] | | Population | `population_total` | 9,963 people | city | 2020-12-31 | 2026-08-05 | stale | verified | [3] | | Median monthly rent | `rent_median_city_eur_month` | 1,639 EUR/month | city | 2024-12-31 | 2026-09-11 | stale | supplemental | [4] | | Median gross salary | `salary_median_gross_city_eur_month` | 3,217 EUR/month | city | 2024-12-31 | 2026-09-11 | stale | supplemental | [5] | | Unemployment rate | `unemployment_total_percent` | 7.75 % | city | 2024-12-31 | 2026-08-03 | stale | verified | [1] | | PM2.5 — annual mean | `air_quality_pm25_annual_ug_m3` | 14.29 µg/m³ | nearest_station | 2024-12-31 | 2026-08-05 | stale | verified | [6] | | Average daytime high by month | `climate_monthly_high_c` | Jan 19.94 · Feb 19.61 · Mar 22.22 · Apr 24.33 · May 25.78 · Jun 29.06 · Jul 32.39 · Aug 33.56 · Sep 31.5 · Oct 26.94 · Nov 23.06 · Dec 19.39 °C | nearest_station | 1991-12-31 | 2026-08-05 | stale | verified | [7] | | Average night-time low by month | `climate_monthly_low_c` | Jan 6.17 · Feb 6.94 · Mar 8.33 · Apr 9.78 · May 12.22 · Jun 14 · Jul 16.83 · Aug 17.06 · Sep 15.78 · Oct 12.17 · Nov 8.33 · Dec 5.28 °C | nearest_station | 1991-12-31 | 2026-08-05 | stale | verified | [7] | | Average temperature by month | `climate_monthly_mean_c` | Jan 13.06 · Feb 13.28 · Mar 15.28 · Apr 17.06 · May 19 · Jun 21.56 · Jul 24.61 · Aug 25.28 · Sep 23.67 · Oct 19.56 · Nov 15.67 · Dec 12.33 °C | nearest_station | 1991-12-31 | 2026-08-05 | stale | verified | [7] | | Average precipitation by month | `climate_monthly_precip_mm` | Jan 96.01 · Feb 109.7 · Mar 67.31 · Apr 17.27 · May 11.43 · Jun 3.3 · Jul 1.52 · Aug 0 · Sep 3.81 · Oct 20.07 · Nov 25.65 · Dec 69.09 mm | nearest_station | 1991-12-31 | 2026-08-05 | stale | verified | [8] | | G04 Air Quality Pm25 Max Ug M3 | `g04_air_quality_pm25_max_ug_m3` | 127.6 µg/m³ | nearest_station | 2024-12-31 | 2026-08-07 | stale | verified | [6] | | G04 Air Quality Pm25 Mean Annual Ug M3 | `g04_air_quality_pm25_mean_annual_ug_m3` | 14.29 µg/m³ | nearest_station | 2024-12-31 | 2026-08-07 | stale | verified | [6] | | City area | `city_area_km2` | 2.4 km² | city | 2025-12-31 | 2026-08-03 | aging | verified | [9] | | Foreign-resident share | `foreign_population_share_percent` | 27.76 % | city | 2024-12-31 | 2026-08-03 | stale | verified | [1] | | Population density | `population_density_per_km2` | 3,929 people/km² | city | 2024-12-31 | 2026-08-03 | stale | verified | [1] | | Airport Direct Destinations Count | `airport_direct_destinations_count` | 14 count | city | 2026-08-03 | 2026-08-03 | fresh | verified | [10] | | Nearest Major Airport Distance Km | `nearest_major_airport_distance_km` | 23 km | city | 2026-08-03 | 2026-08-03 | fresh | verified | [11] | | Nearest Major Airport Iata | `nearest_major_airport_iata` | ONT | city | 2026-08-03 | 2026-08-03 | fresh | verified | [11] | Every row keeps the value, unit, geographic scope, observation date, verification date and the numbered source below. A missing metric means the city does not publish it; nothing is imputed. ## Language courses and integration - [Adult Education and English Language Acquisition (AEFLA)](https://www.ed.gov/adult-programs) — State Language Course · U.S. Department of Education · English · checked 2026-08-10 - [USCIS English and citizenship class finder](https://my.uscis.gov/) — Civic Orientation · U.S. Citizenship and Immigration Services · English · checked 2026-08-10 These are country-level programmes, not proof of a course location in this city. ## Public employment service - [American Job Centers](https://www.usa.gov/job-help) — Job Search This is a country-level service, not proof of a physical office in this city. ## Healthcare access Migrants can receive medical care in Charter Oak when the country-wide insurance or residence conditions are met. City capacity facts do not determine personal eligibility. - Public healthcare access for foreign residents: no — [official source](https://www.healthcare.gov/immigrants/) ## Country-wide rules Visa, benefit, tax and healthcare eligibility rules are published on the [United States country page](https://immigrationdb.com/countries/united-states/). ## Sources 1. Census Reporter (underlying U.S. Census ACS) — Official source — https://api.censusreporter.org/1.0/data/show/latest?table_ids=B05012%2CB23025&geo_ids=16000US0611796%2C16000US0611964%2C16000US0611978%2C16000US0612734%2C16000US0612902%2C16000US0612916%2C16000US0613560%2C16000US0616090%2C16000US0616580%2C16000US0617162 2. U.S. Census Bureau, American Community Survey — Official source — https://api.census.gov/data/2024/acs/acs5?get=NAME%2CB01003_001E%2CB01003_001M&for=place%3A%2A&in=state%3A%2A 3. California Department of Water Resources, Division of Integrated Regional Water Management (BIOS) — Official source — https://services2.arcgis.com/Uq9r85Potqm3MfRV/arcgis/rest/services/biosds3072_fpu/FeatureServer/0/query?where=1%3D1&outFields=GEOID20%2CNAME20%2CNAMELSAD20%2CPop20%2CDAC20&returnGeometry=false&f=json&resultRecordCount=3000 4. Census Reporter ACS 2020-2024 5-year, table B25064 (underlying U.S. Census Bureau ACS) — Community source — https://api.censusreporter.org/1.0/data/show/acs2024_5yr?table_ids=B25064&geo_ids=16000US0612734 5. Census Reporter ACS 2020-2024 5-year, table B20002 (underlying U.S. Census Bureau ACS) — Community source — https://api.censusreporter.org/1.0/data/show/acs2024_5yr?table_ids=B20002&geo_ids=16000US0612734 6. U.S. EPA Air Quality System / AirData — Official source — https://aqs.epa.gov/aqsweb/airdata/annual_conc_by_monitor_2024.zip 7. NOAA National Centers for Environmental Information — Official source — https://www.ncei.noaa.gov/data/normals-monthly/1991-2020/access/USC00047050.csv 8. NOAA National Centers for Environmental Information — Official source — https://www.ncei.noaa.gov/data/normals-monthly/1991-2020/access/USC00042090.csv 9. U.S. Census Bureau (TIGERweb ArcGIS REST service) — Official source — https://tigerweb.geo.census.gov/arcgis/rest/services/TIGERweb/Places_CouSub_ConCity_SubMCD/MapServer/5/query?where=1%3D1&outFields=GEOID,NAME,STATE,PLACE,AREALAND,AREAWATER,INTPTLAT,INTPTLON,LSADC,FUNCSTAT,BASENAME&returnGeometry=false&f=json 10. OpenFlights — Official source — https://raw.githubusercontent.com/jpatokal/openflights/master/data/routes.dat 11. OurAirports — Official source — https://davidmegginson.github.io/ourairports-data/airports.csv ## Cite This citation identifies the ImmigrationDB compilation/page. Underlying source publishers and datasets retain their own terms; inspect the Sources section and cite those records separately. ### APA ImmigrationDB. (2026, September 14). Charter Oak, United States: rent, salary, jobs, air quality [ImmigrationDB compilation; snapshot approved-static-8975a8c3d87026ab; version approved-static-8975a8c3d87026ab]. ImmigrationDB. https://immigrationdb.com/cities/us/charter-oak/ Retrieved 2026-09-14. Compilation license: CC BY 4.0, https://creativecommons.org/licenses/by/4.0/ ### BibTeX ```bibtex @misc{immigrationdb_immigrationdb_charter-oak-united-states-rent-salary-jobs-air-quality_a4046cb1c604, author = {ImmigrationDB}, title = {Charter Oak, United States: rent, salary, jobs, air quality}, publisher = {ImmigrationDB}, year = {2026}, date = {2026-09-14}, version = {approved-static-8975a8c3d87026ab}, snapshot = {approved-static-8975a8c3d87026ab}, url = {https://immigrationdb.com/cities/us/charter-oak/}, note = {Retrieved 2026-09-14. ImmigrationDB compilation. Compilation license: CC BY 4.0, https://creativecommons.org/licenses/by/4.0/}, } ``` ### Markdown [Charter Oak, United States: rent, salary, jobs, air quality](https://immigrationdb.com/cities/us/charter-oak/) — ImmigrationDB; ImmigrationDB; snapshot approved-static-8975a8c3d87026ab; version approved-static-8975a8c3d87026ab; retrieved 2026-09-14; built 2026-09-14. - Citation schema: `immigrationdb-citation-v1` - Canonical URL: https://immigrationdb.com/cities/us/charter-oak/ - Title: Charter Oak, United States: rent, salary, jobs, air quality - Author: ImmigrationDB - Publisher: ImmigrationDB - Snapshot: `approved-static-8975a8c3d87026ab` - Version: `approved-static-8975a8c3d87026ab` - Retrieved: 2026-09-14 - Built: 2026-09-14 - Compilation license: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) ## Data - HTML: https://immigrationdb.com/cities/us/charter-oak/ - JSON: https://immigrationdb.com/data/cities/us/charter-oak.json - Markdown: https://immigrationdb.com/data/cities/us/charter-oak.md - MCP resource: immigrationdb://city/us/charter-oak - Metric dictionary: https://immigrationdb.com/data/metrics.json - City shard index: https://immigrationdb.com/data/cities/index.json - Release catalog: https://immigrationdb.com/data/catalog.json