What's the singular form of co-location? Here's the word you're looking for.
Answer
The noun co-location can be countable or uncountable.
The singular form of co-location is also co-location.
Examples
What about co-location in a hipster coffee bar near the High Line?
Since the Chapter 11 bankruptcy of our west coast co-location provider, we have been routing all of our traffic through our secondary server farm in New York City.