Worth noting that 10kT is 3 orders of magnitude(!) smaller than current warheads. The "instant death" diameter is > 10 miles nowadays. So yea, just a full city :)
> The "instant death" radius is > 10 miles nowadays.
I don't know where you're getting this information.
The "moderate damage" blast radius for the Minuteman missile, currently in service in the US, isn't even 10 miles. The moderate radius for the Russian "Topol"/SS-25 is only ~11 miles.
The blast radius of the Tsar Bomba, the largest nuclear weapon ever detonated, is only ~5 miles for "heavy damage" and just over 12 for "moderate damage".
Edit: radius -> diameter