in a factory
Talking about location or work
Use in a factory to describe where someone works or where something happens.
Thousands of people are employed in a factory nearby.
Using prepositions with "factory"
In factory is usually a location phrase and normally needs an article. Factory of appears in limited formal or descriptive uses.
Quick answer
Should I use "in factory" or "of factory"?
English usually says in a factory or in the factory when talking about location. Factory of is uncommon but possible in phrases such as a factory of ideas or the factory of the future. The bare phrase in factory without an article is generally unnatural in standard English.
She works in a factory outside the city.
The lab became a factory of ideas during the project.
Production increased in the factory last year.
The lab became a factory of ideas during the project.
Production increased in the factory last year.
Choose the pattern by meaning
These forms are not interchangeable. Choose the construction by meaning, not by which preposition appears most often.
factory of + noun
Using figurative or descriptive meaning
Factory of is used in figurative expressions or formal descriptions.
The studio became a factory of creativity for young artists.
factory for + product
Showing production purpose
Use factory for to describe what is produced there.
They built a new factory for electric vehicles.
at the factory
Referring to a workplace location
At the factory focuses on the general place or site.
Visitors arrived at the factory early in the morning.
See the difference in context
The same subject can take different constructions because each sentence answers a different question.
Construction
Example
Meaning
in factory
"In factory" usually needs an article: in a factory.
location phrase that normally requires a determiner
of factory
The phrase "of factory" is not a standard combination by itself.
generally unnatural unless part of a longer phrase
in a factory
He learned welding in a factory.
inside or employed at a factory
factory of
The city became a factory of innovation.
figurative source or producer
at the factory
We met at the factory after lunch.
general workplace location
Common mistakes
Some combinations appear in real text but do not mean what learners often assume.
Omitting the article
Factory is a countable noun and usually needs a or the.
✕ She works in factory. ✓ She works in a factory.Using "of factory" alone
This combination is not normally idiomatic by itself.
✕ the manager of factory ✓ the manager of the factoryConfusing "in" and "at"
In emphasizes being inside; at refers more generally to the place.
✓ He is at the factory today.Using figurative "factory of" too broadly
Factory of is mostly used in creative or descriptive expressions.
✕ factory of machines ✓ factory for machinesQuick practice
Choose the expression that matches the intended meaning.
1. My grandfather worked ___ a factory for thirty years.
2. The workshop became a factory ___ new ideas.
3. We arrived ___ the factory before sunrise.
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Frequently asked questions
Is "in factory" correct?
Usually no. Standard English normally uses in a factory or in the factory.
When can I use "factory of"?
It appears mainly in figurative or descriptive expressions such as factory of ideas.
What is the difference between "in the factory" and "at the factory"?
In emphasizes being inside the building, while at refers more generally to the location.
Related preposition guides
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