  We count the number of rational elliptic curves of bounded naive height that
have a rational $N$-isogeny, for $N \in \{2,3,4,5,6,8,9,12,16,18\}$. For some
$N$, this is done by generalizing a method of Harron and Snowden. For the
remaining cases, we use the framework of Ellenberg, Satriano and Zureick-Brown,
in which the naive height of an elliptic curve is the height of the
corresponding point on a moduli stack.
