# San Diego District, La Unión Canton, Cartago Province

> Source: https://wherepedia.org/costa-rica/cartago/la-union/san-diego/

District · La Unión Canton 

# San Diego

San Diego is a district of Costa Rica in La Unión Canton, Cartago Province. It had an estimated **25,104 people** in 2021 on 8 km² (about 3,107 per km²). 12 named villages and localities are recorded here, and 56 mapped services such as hospitals, banks and schools.

- 25,104people (2021)
- 8.1km²
- 56mapped services
- 1,292 mtypical elevation

## How many people live in San Diego?

San Diego had an estimated **25,104 people** in 2021 — 22.1% of La Unión Canton, 52nd of 472 districts. There are 992 women for every 1,000 men (close to the La Unión Canton figure of 993). Spread over 8 km², that is about **3,107 people per km²**, 70th of 472 districts.

20.9% of people are children under 15 and 8.6% are 65 or older; the median age is about 33 years (it is 34 across La Unión Canton). For every 100 people of working age (15–64) there are 42 children and older people.

0–4 ****1,680**

5–9 ****1,815**

10–14 ****1,759**

15–19 ****1,762**

20–24 ****2,027**

25–29 ****2,203**

30–34 ****2,264**

35–39 ****2,083**

40–44 ****1,771**

45–49 ****1,519**

50–54 ****1,472**

55–59 ****1,428**

60–64 ****1,156**

65–69 ****868**

70–74 ****555**

75+ ****742**

Source: [Costa Rica National Statistics Office (NSO) via OCHA HDX, population 2021 (COD-PS, CC BY-IGO)](https://data.humdata.org/dataset/cod-ps-cri).

## Where is San Diego?

San Diego lies in [La Unión Canton](https://wherepedia.org/costa-rica/cartago/la-union/), [Cartago Province](https://wherepedia.org/costa-rica/cartago/), [Costa Rica](https://wherepedia.org/costa-rica/). It borders 7 other districts: [Guadalupe o Arenilla](https://wherepedia.org/costa-rica/cartago/cartago/guadalupe-o-arenilla/), [Patarrá](https://wherepedia.org/costa-rica/san-jose/desamparados/patarra/), [Quebradilla](https://wherepedia.org/costa-rica/cartago/cartago/quebradilla/), [Río Azul](https://wherepedia.org/costa-rica/cartago/la-union/rio-azul/), [San Juan](https://wherepedia.org/costa-rica/cartago/la-union/san-juan/), [San Rafael](https://wherepedia.org/costa-rica/cartago/la-union/san-rafael/) and [Tres Ríos](https://wherepedia.org/costa-rica/cartago/la-union/tres-rios/). By area it is the 380th largest of 492 districts in Costa Rica. It covers 18.3% of [La Unión Canton](https://wherepedia.org/costa-rica/cartago/la-union/). The centre of San Diego is about 11 km in a straight line from San José, the capital. The centre point is at 9.8919° N, 83.9936° W.

Source: [Costa Rica National Statistics Office (NSO) via OCHA HDX, administrative boundaries (COD-AB, CC BY-IGO)](https://data.humdata.org/dataset/cod-ab-cri).

## Things to see in and around San Diego

### Nearby, outside San Diego

- Casa de la Cultura · gallery, Tres Ríos1.8 km
- Casa de la Juventud · gallery, Tres Ríos1.9 km
- Arte Blanco · gallery, Sánchez3.2 km
- Casa Real Platino · gallery, Sánchez3.2 km
- Momnumento Las Fuentes del Padre Carazo · memorial, San Rafael4.1 km
- Reserva Natural Protegida · nature reserve, Concepción4.5 km
- Corredor Biológico Río María Aguilar · nature reserve, Concepción4.7 km
- Muñeco del Herrero de San Antonio · monument, San Antonio5.9 km
- Parque de San Antonio · attraction, San Antonio5.9 km
- Museo de la Carreta y el Campesino Costarricense · museum, Gravilias6.6 km
- Reserva Nacional Río Reventado · nature reserve, San Nicolás6.9 km
- Mapa de Costa Rica · monument, Mata de Plátano6.9 km

Source: [© OpenStreetMap contributors (ODbL), Geofabrik extract — named settlements](https://www.openstreetmap.org/copyright).

Named attractions, museums, viewpoints, historic sites and natural features mapped in OpenStreetMap. Places of worship are not listed.

## Know before you go: San Diego

- Time zoneUTC−6, no daylight saving · America/Costa_Rica
- CurrencyColon (CRC)
- Country calling code+506
- LanguagesSpanish, English
- Plug typesType A, B · 120 V
- Driving sideRight
- Postcode format5 digits (#####)

### Nearest airports

- Tobías Bolaños International Airport (SYQ) · San Jose18 km
- Juan Santamaría International Airport (SJO) · San José (Alajuela)26 km

### Nearest railway station

Tres Ríos (Tres Ríos), about 2.2 km from the centre.

### Daylight

Days are longest in Jun (about 12.7 hours, sunrise around 05:15) and shortest in Dec (about 11.6 hours, sunrise around 05:44, sunset around 17:17).

Source: [GeoNames country and time-zone files (CC BY 4.0)](https://www.geonames.org/); [Wikidata (CC0) — plug types, mains voltage, driving side; retrieved 2026-11-03](https://www.wikidata.org/); [OurAirports (public domain)](https://ourairports.com/data/).

Airports with scheduled passenger flights; straight-line distances. Daylight is calculated for the 15th of each month in local standard time. Check entry and visa rules with official government sources before travelling.

## Villages and localities in San Diego

Open gazetteers list **12 villages, towns and localities** in San Diego. The largest with a recorded population: San Diego (16,991). Settlements here lie between about 1,264 m and 1,293 m above sea level (median 1,292 m).

- Eulalia
- Florencio del Castillo
- Girales
- Invu San Diego
- La Mecanizada
- Montufar
- Omega
- San Diego
- San Martín
- Santiago del Monte
- Tacona
- Tacora

Source: [GeoNames (CC BY 4.0) — settlements, natural and historic features](https://www.geonames.org/); [© OpenStreetMap contributors (ODbL), Geofabrik extract — named settlements](https://www.openstreetmap.org/copyright).

## Landscape and landmarks of San Diego

Named natural and historic features inside San Diego, from the GeoNames gazetteer.

### Water

2 rivers and streams.

- Quebrada Monte
- Río Bosque

Source: [GeoNames (CC BY 4.0) — settlements, natural and historic features](https://www.geonames.org/).

Places of worship are not listed. Elevations are from the GeoNames terrain model and are approximate.

## Weather in San Diego and the best time to visit

Using the climate of La Unión Canton, the warmest month is May (average 21 °C) and the coolest is Jan (19 °C). About 2,266 mm of rain falls in a year; the wettest month is Oct (285 mm) and the driest Feb (70 mm). The most comfortable months for a visit are **January to April**.

- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec

Month Average °C Rain mm 

Jan 19 119 

Feb 19 70 

Mar 20 76 

Apr 21 117 

May 21 243 

Jun 21 239 

Jul 20 253 

Aug 21 214 

Sep 21 231 

Oct 20 285 

Nov 20 258 

Dec 20 162 

Source: [NASA POWER climatology, retrieved 2026-10-29](https://power.larc.nasa.gov/).

## Nearest hospital, bank and fuel from San Diego

Need Nearest mapped Distance 

Hospital Medicentro Salud Integral · San Diego 1.7 km [Map](https://www.openstreetmap.org/?mlat=9.90322&mlon=-84.00436#map=17/9.90322/-84.00436) 

Bank Banco Popular · Tres Ríos 1.1 km [Map](https://www.openstreetmap.org/?mlat=9.90136&mlon=-83.99589#map=17/9.90136/-83.99589) 

ATM BAC Credomatic · Curridabat 5.2 km [Map](https://www.openstreetmap.org/?mlat=9.92417&mlon=-84.02769#map=17/9.92417/-84.02769) 

Petrol pump Servi Indoor Tres Ríos · Tres Ríos 1.5 km [Map](https://www.openstreetmap.org/?mlat=9.90497&mlon=-83.98881#map=17/9.90497/-83.98881) 

Hotel Hotel Hayyt · Sánchez 3.3 km [Map](https://www.openstreetmap.org/?mlat=9.91048&mlon=-84.01730#map=17/9.91048/-84.01730) 

Mall Terramall · San Diego 1.1 km [Map](https://www.openstreetmap.org/?mlat=9.90170&mlon=-83.99682#map=17/9.90170/-83.99682) 

School Escuela Santiago del Monte · San Diego 0.3 km [Map](https://www.openstreetmap.org/?mlat=9.89306&mlon=-83.99611#map=17/9.89306/-83.99611) 

College Universidad Juan Pablo II · Sánchez 3.4 km [Map](https://www.openstreetmap.org/?mlat=9.90855&mlon=-84.01961#map=17/9.90855/-84.01961) 

Police station Delegación Cantonal de Policía de La Unión · Tres Ríos 1.8 km [Map](https://www.openstreetmap.org/?mlat=9.90676&mlon=-83.98826#map=17/9.90676/-83.98826) 

Source: [Overture Maps places (CDLA-Permissive-2.0) and © OpenStreetMap contributors (ODbL)](https://overturemaps.org/).

Straight-line distance from the centre of the division, within 40 km.

## Hospitals, banks and other services in San Diego

Places mapped inside San Diego in open map data, by type.

- Hospitals2
- Banks8
- Shopping malls2
- Schools6
- Cinemas4
- Pharmacies4
- Restaurants26
- Police stations2
- Dental clinics2

Source: [Overture Maps places (CDLA-Permissive-2.0) and © OpenStreetMap contributors (ODbL)](https://overturemaps.org/).

Coverage depends on what has been mapped; contact details are not shown.

## Other districts in La Unión Canton

- Concepción
- Dulce Nombre
- Río Azul
- San Juan
- San Rafael
- San Ramón
- Tres Ríos

## Quick answers

- Where is San Diego?In La Unión Canton, Cartago Province, Costa Rica
- What is the population of San Diego?25,104 (2021 estimate)
- What is the median age in San Diego?About 33 years (2021 estimate)
- What is the population density of San Diego?About 3,107 people per km²
- What borders San Diego?Guadalupe o Arenilla, Patarrá, Quebradilla, Río Azul, San Juan, San Rafael and Tres Ríos
- What is there to see in San Diego?Casa de la Cultura, Casa de la Juventud, Arte Blanco, Casa Real Platino
- What time zone is San Diego in?UTC−6
- What currency is used in San Diego?Colon (CRC)
- What language is spoken in San Diego?Spanish, English (main languages nationally)
- How many villages are in San Diego?12 named settlements (GeoNames, OpenStreetMap)
- What is the elevation of San Diego?Settlements lie between 1,264 m and 1,293 m
- What is the best time to visit San Diego?January to April
- Where is the nearest hospital to San Diego?Medicentro Salud Integral, about 1.7 km from the centre
- Where is the nearest bank to San Diego?Banco Popular, about 1.1 km from the centre
- Where is the nearest ATM to San Diego?BAC Credomatic, about 5.2 km from the centre
- Where is the nearest petrol pump to San Diego?Servi Indoor Tres Ríos, about 1.5 km from the centre
- How many hospitals are in San Diego?2 mapped
- How many banks are in San Diego?8 mapped
- What is the P-code of San Diego?CR30302 (OCHA common operational dataset)