Spinster matches bachelor although the usage of it differs somewhat. Bachelor still has some positive connotations whereas I am struggling to think of a time that where spinster had a positive spin.
I used to work in a capacity where I saw a lot of marriage and death certificates. It was always interesting looking at them because they covered a large period of time - approx 1900 to the early 90s. What I never realised was that Spinster and Bachelor were used in two ways on the certificates - as both occupation and marital status. While it was far more common for spinster to be written twice -as compared to bachelor - we used to find it interesting trying to work out what a bachelor was when it came to employment. General consensus was someone unemployed but supported by their family or other independant means. Probably completely incorrect but that was what we thought.
I suppose now with computer templates and specific fields and drop down menus there's less chance of ambiguous little descriptions and 'free text' being included in that kind of thing. Pity really.

