In chapter 33 we have this conversation between John Dashwood and Elinor.
"Who is Colonel Brandon? Is he a man of fortune?"
"Yes; he has very good property in Dorsetshire."
Strangely, I always believed that he lived near Barton, but instead his estate is at a distance of at least 30 miles.
(We also learn that his income is probably 2000 a year).