I got it:
library(rjson)
library(plyr)
test<-fromJSON(file=url("http://api.census.gov/data/2010/sf1?key=mykey&get=P0030001,NAME&for=county:*&in=state:48";))
test2<-ldply(test)[-1,]
names(test2)<-ldply(test)[1,]
head(test2)
P0030001 NAME state county
2 58458 Anderson County 48 001
3 14786 Andrews County 48 003
4 86771 Angelina County 48 005
5 23158 Aransas County 48 007
6 9054 Archer County 48 009
7 1901 Armstrong County 48 011
-----
Corey Sparks, PhD
Assistant Professor
Department of Demography
University of Texas at San Antonio
501 West César E. Chávez Blvd
Monterey Building 2.270C
San Antonio, TX 78207
210-458-3166
corey.sparks 'at' utsa.edu
coreysparks.weebly.com
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