The house sparrow's Latin name is Passer domesticus. Passer is Latin for sparrow. Domesticus is you in your house and yard — domesticated.
If you can't find people at a particular location you're unlikely to find a house sparrow, either. They are seriously domesticated.
House sparrows are common, not colorful, sing a non-song, and generally are ignored by serious birders. They are, however, very interesting creatures.
The house sparrow song is worthy of early mention. The bird says/sings cheep. That's it, that's the song, first verse, last verse, melody, everything. It is a bird song you can learn and probably sing.
Approximately 5,000 research papers have been published with these little birds as study species. They're popular study subjects because of accessibility and quantity. If a house sparrow is likely to help answer the research question being asked, being numerous and convenient is a plus. Many bird research projects follow the same path.
The passer family of birds is large in species and total numbers. There are 28 species worldwide, accounting for billions of birds.
BirdLife International, a European charitable organization, in 2015 gave a "very preliminary estimate" of total global population of house sparrows at somewhere between 896 million and 1.3 billion. Other estimates range from 520 million to 1.6 billion.
There is no question, however, about their distribution: everywhere except Antarctica.