The CIA World Factbook Every edition, 1990 to 2025 Middle East
Capital Iran, in 36 editions.
The entry for Iran published Capital in 36 editions of 36, from 1990 to 2025. The text changed in 13 editions. Each is shown as published. Capital in every entry.
- editions changed the text
- 13
- the first edition with it
- 1990
- the latest edition with it
- 2025
Published as “Capital” (1990 to 2025) and “National capital” (1997 to 1998).
field in that editiontext changed from the edition beforenot in that editionthe edition shownChoose an edition on the strip beside the text, or step through them with the arrows. Mark changes compares it with the edition before: the marks are ours, words added and words removed.
2025 edition
Changed since 2024The same text in 7 editions, 1990 to 1996.
Tehran
Tehran
The same text in 1997 and 1998.
Published as “National capital”
Tehran
Tehran
The same text in 7 editions, 1999 to 2005.
Tehran
Tehran
- name:
- Tehran
- geographic coordinates:
- 35 40 N, 51 26 E
- time difference:
- UTC+3.5 (8.5 hours ahead of Washington, DC during Standard Time)
name: Tehran
geographic coordinates: 35 40 N, 51 26 E
time difference: UTC+3.5 (8.5 hours ahead of Washington, DC during Standard Time)
The same text in 2007 and 2008.
- name:
- Tehran
- geographic coordinates:
- 35 40 N, 51 25 E
- time difference:
- UTC+3.5 (8.5 hours ahead of Washington, DC during Standard Time)
name: Tehran
geographic coordinates: 35 40 N, 51 26 25 E
time difference: UTC+3.5 (8.5 hours ahead of Washington, DC during Standard Time)
- name:
- Tehran
- geographic coordinates:
- 35 40 N, 51 25 E
- time difference:
- UTC+3.5 (8.5 hours ahead of Washington, DC during Standard Time)
name:
Tehran
geographic coordinates:
35 40 N, 51 25 E
time difference:
UTC+3.5 (8.5 hours ahead of Washington, DC during Standard Time)
- name:
- Tehran
- geographic coordinates:
- 35 40 N, 51 25 E
- time difference:
- UTC+3.5 (8.5 hours ahead of Washington, DC during Standard Time)
- daylight saving time:
- +1hr, begins fourth Monday in March; ends fourth Wednesday in September
name:
Tehran
geographic coordinates:
35 40 N, 51 25 E
time difference:
UTC+3.5 (8.5 hours ahead of Washington, DC during Standard Time)
daylight saving time:
+1hr, begins fourth Monday in March; ends fourth Wednesday in September
- name:
- Tehran
- geographic coordinates:
- 35 40 N, 51 25 E
- time difference:
- UTC+3.5 (8.5 hours ahead of Washington, DC during Standard Time)
- daylight saving time:
- +1hr, begins fourth Tuesday in March; ends fourth Thursday in September
name:
Tehran
geographic coordinates:
35 40 N, 51 25 E
time difference:
UTC+3.5 (8.5 hours ahead of Washington, DC during Standard Time)
daylight saving time:
+1hr, begins fourth Monday Tuesday in March; ends fourth Wednesday Thursday in September
The same text in 2012 and 2013.
- name:
- Tehran
- geographic coordinates:
- 35 42 N, 51 25 E
- time difference:
- UTC+3.5 (8.5 hours ahead of Washington, DC during Standard Time)
- daylight saving time:
- +1hr, begins fourth Tuesday in March; ends fourth Thursday in September
name:
Tehran
geographic coordinates:
35 40 42 N, 51 25 E
time difference:
UTC+3.5 (8.5 hours ahead of Washington, DC during Standard Time)
daylight saving time:
+1hr, begins fourth Tuesday in March; ends fourth Thursday in September
- name:
- Tehran
- geographic coordinates:
- 35 42 N, 51 25 E
- time difference:
- UTC+3.5 (8.5 hours ahead of Washington, DC, during Standard Time)
- daylight saving time:
- +1hr, begins fourth Tuesday in March; ends fourth Thursday in September
name:
Tehran
geographic coordinates:
35 42 N, 51 25 E
time difference:
UTC+3.5 (8.5 hours ahead of Washington, DC DC, during Standard Time)
daylight saving time:
+1hr, begins fourth Tuesday in March; ends fourth Thursday in September
The same text in 2015 and 2016.
- name:
- Tehran
- geographic coordinates:
- 35 42 N, 51 25 E
- time difference:
- UTC+3.5 (8.5 hours ahead of Washington, DC, during Standard Time)
- daylight saving time:
- +1hr, begins fourth Tuesday in March; ends fourth Thursday in September
name:
geographic coordinates:
time difference:
daylight saving time:
The same text in 3 editions, 2017 to 2019.
- name:
- Tehran
- geographic coordinates:
- 35 42 N, 51 25 E
- time difference:
- UTC+3.5 (8.5 hours ahead of Washington, DC, during Standard Time)
- daylight saving time:
- +1hr, begins fourth Wednesday in March; ends fourth Friday in September
name: Tehran
geographic coordinates: 35 42 N, 51 25 E
time difference: UTC+3.5 (8.5 hours ahead of Washington, DC, during Standard Time)
daylight saving time: +1hr, begins fourth Tuesday Wednesday in March; ends fourth Thursday Friday in September
The same text in 2020 and 2021.
- name:
- Tehran
- geographic coordinates:
- 35 42 N, 51 25 E
- time difference:
- UTC+3.5 (8.5 hours ahead of Washington, DC, during Standard Time)
- daylight saving time:
- +1hr, begins fourth Wednesday in March; ends fourth Friday in September
- etymology:
- various explanations of the city's name have been proffered, but the most plausible states that it derives from the Persian words "tah" meaning "end or bottom" and "ran" meaning "[mountain] slope" to signify "bottom of the mountain slope";
- Tehran lies at the bottom slope of the Elburz Mountains
name: Tehran
geographic coordinates: 35 42 N, 51 25 E
time difference: UTC+3.5 (8.5 hours ahead of Washington, DC, during Standard Time)
daylight saving time: +1hr, begins fourth Wednesday in March; ends fourth Friday in September
etymology: various explanations of the city's name have been proffered, but the most plausible states that it derives from the Persian words "tah" meaning "end or bottom" and "ran" meaning "[mountain] slope" to signify "bottom of the mountain slope"; Tehran lies at the bottom slope of the Elburz Mountains
The same text in 2022 and 2023.
- name:
- Tehran
- geographic coordinates:
- 35 42 N, 51 25 E
- time difference:
- UTC+3.5 (8.5 hours ahead of Washington, DC, during Standard Time)
- daylight saving time:
- +1hr, begins fourth Wednesday in March; ends fourth Friday in September
- etymology:
- various explanations of the city's name have been proffered, but the most plausible states that it derives from the Persian words tah meaning "end or bottom" and ran meaning "[mountain] slope" to signify "bottom of the mountain slope";
- Tehran lies at the bottom slope of the Elburz Mountains
name: Tehran
geographic coordinates: 35 42 N, 51 25 E
time difference: UTC+3.5 (8.5 hours ahead of Washington, DC, during Standard Time)
daylight saving time: +1hr, begins fourth Wednesday in March; ends fourth Friday in September
etymology: various explanations of the city's name have been proffered, but the most plausible states that it derives from the Persian words "tah" tah meaning "end or bottom" and "ran" ran meaning "[mountain] slope" to signify "bottom of the mountain slope"; Tehran lies at the bottom slope of the Elburz Mountains
- name:
- Tehran
- geographic coordinates:
- 35 42 N, 51 25 E
- time difference:
- UTC+3.5 (8.5 hours ahead of Washington, DC)
- daylight saving time:
- does not observe daylight savings time
- etymology:
- various explanations of the city's name have been proffered, but the most plausible states that it derives from the Persian words tah meaning "end or bottom" and ran meaning "[mountain] slope" to signify "bottom of the mountain slope";
- Tehran lies at the bottom slope of the Elburz Mountains
name: Tehran
geographic coordinates: 35 42 N, 51 25 E
time difference: UTC+3.5 (8.5 hours ahead of Washington, DC, during Standard Time) DC)
daylight saving time: +1hr, begins fourth Wednesday in March; ends fourth Friday in September does not observe daylight savings time
etymology: various explanations of the city's name have been proffered, but the most plausible states that it derives from the Persian words tah meaning "end or bottom" and ran meaning "[mountain] slope" to signify "bottom of the mountain slope"; Tehran lies at the bottom slope of the Elburz Mountains
- name:
- Tehran
- geographic coordinates:
- 35 42 N, 51 25 E
- time difference:
- UTC+3.5 (8.5 hours ahead of Washington, DC)
- daylight saving time:
- does not observe daylight savings time
- etymology:
- the name probably means "flat" or "lower," referring to its location in the foothills of the Elburz Mountains
name: Tehran
geographic coordinates: 35 42 N, 51 25 E
time difference: UTC+3.5 (8.5 hours ahead of Washington, DC)
daylight saving time: does not observe daylight savings time
etymology: various explanations of the city's name have been proffered, but the most plausible states that it derives from the Persian words tah meaning "end probably means "flat" or bottom" and ran meaning "[mountain] slope" "lower," referring to signify "bottom of the mountain slope"; Tehran lies at its location in the bottom slope foothills of the Elburz Mountains
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Cite this page
Central Intelligence Agency. “Iran: Capital.” The World Factbook, 1990–2025 editions. Archived by The Factbook, thefactbook.org/iran/capital.