  We report extremely large magnetoresistance (MR) in an extended temperature
regime from 1.5 K to 300 K in non-magnetic binary compounds TaP and NbP. TaP
exhibits linear MR around $1.8\times 10^4$ at 2 K in a magnetic field of 9
Tesla, which further follows its linearity up to $1.4\times 10^5$ in a magnetic
field of 56 Tesla at 1.5 K. At room temperature the MR for TaP and NbP follows
a power law of the exponent about $1.5$ with the values larger than $300\%$ in
a magnetic field of 9 Tesla. Such large MR in a wide temperature regime is not
likely only due to a resonance of the electron-hole balance, but indicates a
complicated mechanism underneath.
