Obviously depends on a combination of factors, such as the State you work in, the size of the firm you work for, the financial health of that firm and the state of the legal market more broadly, whether you are male or female etc..
As a very rough guide, you might find
this report helpful from page 96 onwards. The numbers seem to be consistent with other websites I have seen.
TLDR version:
- For a graduate at a top-tier firm (however they have defined this), in the ballpark of $55-70k
- For a graduate at a mid-tier firm (however they have defined this), in the ballpark of $45-65k
- For a graduate in a small practice (however they have defined this), in the ballpark of $30 to $50k
With capacity for benefits on the side, although most grads won't be paid bonuses.
They don't list public sector starting salaries for lawyers in the report but they would most likely be at the lower end of the scale.
I doubt there is any difference between starting salaries for JD and LLB students.
Hope that helps.