There is no difference in meaning — geographic and geographical are interchangeable adjectives, and both are fully standard: "geographic distribution" and "geographical distribution" say the same thing. What decides the choice is habit and fixed names: it is always National Geographic and a geographic information system (GIS), but a geographical mile.
The core point: they mean the same thing
English has a stack of pairs like this — economic/economical, historic/historical, electric/electrical — and in some of them the two forms have drifted into separate meanings. This is not one of those pairs. Geographic and geographical both mean "relating to geography", and no dictionary or style guide assigns them different senses.
Both of these are correct, and neither is more precise:
- The survey shows a clear geographic pattern.
- The survey shows a clear geographical pattern.
How to choose
Since meaning cannot decide it, three things can.
- Fixed names and terms. These are not variable. Write National Geographic, geographic information system (GIS), Geographic North Pole; but geographical mile and Royal Geographical Society. If the phrase is a proper name or a technical term, look it up rather than choosing.
- Regional habit. Both forms appear on both sides of the Atlantic. American writing leans a little towards geographic; British writing uses geographical comfortably and often. Neither will look wrong to either audience.
- Consistency. This is the one that actually matters. Pick one for a document and stay with it. Alternating between the two within a report looks careless even though each instance is defensible.
The test to run
Ask: is this part of a set name or an established technical term? If yes, the form is fixed and you copy it. If no, either word is right — so use whichever your document already uses, and if it uses neither yet, pick the shorter one and move on.
The adverb is not a choice
Only one adverb exists: geographically. There is no "geographicly". So "the sites are geographically dispersed" is your only option, whichever adjective you prefer elsewhere.
The trap
The real error here is not picking the wrong one — it is assuming a distinction and defending it. People sometimes claim that geographic is for physical space and geographical for the academic discipline. That rule is not observed by geographers, publishers or dictionaries; you will find both forms doing both jobs in the same journal. If someone corrects your geographic to geographical, they are expressing a preference, not fixing a mistake.
Compare this with historic and historical, where the split is real and worth keeping: a historic speech is a famous one, a historical speech is one from the past. Geography has no such split.
Frequently Asked Questions
Which is more common, geographic or geographical?
Both are common. Geographic has the edge in American writing and in technical contexts like GIS; geographical remains very common in British writing and in academic titles. Neither is rare enough to look odd.
Is it "geographic location" or "geographical location"?
Either. "Geographic location" is the more frequent collocation, particularly in data and mapping contexts, but "geographical location" is equally correct English.
Is there a "geographicly"?
No. The only adverb is geographically, formed from geographical, and it serves both adjectives.